Legend
1979 - EU9 - 9 Member States: Germany, France, Italy, the Netherlands, Belgium, Luxembourg, the UK, Denmark and Ireland.
1984 - EU10 - The 9 Member States + Greece in 1981.
1989 - EU12 - The 10 Member States + Spain and Portugal in 1986.
1994 - EU12 - 12 Member States.
1999 - EU15 - The 12 Member States + Austria, Sweden and Finland in 1995.
2004 - EU25 - The 15 Member States + Poland, Hungary, Slovenia, Slovakia, the Czech Republic, Estonia, Latvia, Lithuania, Cyprus and Malta in 2004.
2009 - EU27 - The 25 Member States + Bulgaria and Romania in 2007.
First legislature : 1979-1984 - Incoming Parliament (Constituent)
| Political group |
Seats |
| S |
112 |
| EPP |
108 |
| ED |
63 |
| COM |
44 |
| L |
40 |
| DEP |
22 |
| CDI |
11 |
| NI |
10 |
| Total |
410 |
Legend
S : Socialist Group
EPP : Group of the European People's Party (Christian-Democratic Group)
ED : European Democratic Group
COM : Communist and Allies Group (SF, Ind. Sin.)
L : Liberal and Democratic Group
DEP : Group of European Progressive Democrats
CDI : Group for the Technical Coordination and Defence of Indipendent Groups and Members
NI : Non-attached
First legislature : 1979-1984 - Outgoing Parliament
| Political group |
Seats |
| S |
124 |
| EPP |
117 |
| ED |
63 |
| COM |
48 |
| L |
38 |
| DEP |
22 |
| CDI |
12 |
| NI |
10 |
| Total |
434 |
Legend
S : Socialist Group
EPP : Group of the European People's Party (Christian-Democratic Group)
ED : European Democratic Group
COM : Communist and Allies Group (SF, Ind. Sin.)
L : Liberal and Democratic Group
DEP : Group of European Progressive Democrats
CDI : Group for the Technical Coordination and Defence of Indipendent Groups and Members
NI : Non-attached
Second legistature : 1984 - 1989 - Incoming Parliament (Constituent)
| Political group |
Seats |
| S |
130 |
| EPP |
110 |
| ED |
50 |
| COM |
41 |
| L |
31 |
| RDE |
29 |
| ARC |
20 |
DR |
16 |
| NI |
7 |
| Total |
434 |
Legend
S : Socialist Group
EPP : Group of the European People's Party (Christian-Democratic Group)
ED : European Democratic Group
COM : Communist and Allies Group (SF, Ind. Sin.)
L : Liberal and Democratic Group
RDE : Group of the European Democratic Alliance
ARC : Rainbow Group: Federation of the Green Alternative European Links, Agelev-Ecolo, the Danish People's Movement against Membership of the European Community and the European Free Alliance in the European Parliament
DR : Group of the European Right
NI : Non-attached
Second legistature : 1984 - 1989 - Outgoing Parliament
| Political group |
Seats |
| PES |
166 |
| EPP |
113 |
| ED |
66 |
| COM |
48 |
| LDR |
45 |
| RDE |
30 |
| ARC |
20 |
| DR |
16 |
| NI |
14 |
| Total |
518 |
Legend
PES : Group of the Party of European Socialists
EPP : Group of the European People's Party (Christian-Democratic Group)
ED : European Democratic Group
COM : Communist and Allies Group (SF, Ind. Sin.) (SF, Ind. Sin.)
LDR : Liberal and Democratic Reformist Group
RDE : Group of the European Democratic Alliance
ARC : Rainbow Group: Federation of the Green Alternative European Links, Agelev-Ecolo, the Danish People's Movement against Membership of the European Community and the European Free Alliance in the European Parliament
DR : Group of the European Right
NI : Non-attached
Third legislature : 1989 - 1994 - Incoming Parliament (Constituent)
| Political group |
Seats |
| PES |
180 |
| EPP |
121 |
| LDR |
49 |
| ED |
34 |
| V |
30 |
| GUE |
28 |
| RDE |
20 |
| DR |
17 |
| CG |
14 |
| ARC |
13 |
| NI |
12 |
| Total |
518 |
Legend
PES : Group of the Party of European Socialists
EPP : Group of the European People's Party (Christian-Democratic Group)
LDR : Liberal and Democratic Reformist Group
ED : European Democratic Group
V : The Green Group in the European Parliament
GUE : Group for the European United Left
RDE : Group of the European Democratic Alliance
DR : Group of the European Right
CG : Left Unity
ARC : Rainbow Group: Federation of the Green Alternative European Links, Agelev-Ecolo, the Danish People's Movement against Membership of the European Community and the European Free Alliance in the European Parliament
NI : Non-attached
Third legislature : 1989 - 1994 - Outgoing Parliament
| Political group |
Seats |
| PES |
198 |
| EPP-ED |
162 |
| LDR |
45 |
| V |
27 |
| RDE |
20 |
| ARC |
14 |
| CG |
13 |
| DR |
12 |
| NI |
27 |
| Total |
518 |
Legend
PES : Group of the Party of European Socialists
EPP-ED : Group of the European People's Party (Christian Democrats) and European Democrats
LDR : Liberal and Democratic Reformist Group
V : The Green Group in the European Parliament
ARC : Rainbow Group: Federation of the Green Alternative European Links, Agelev-Ecolo, the Danish People's Movement against Membership of the European Community and the European Free Alliance in the European Parliament
RDE : Group of the European Democratic Alliance
CG : Left Unity
DR : Group of the European Right
NI : Non-attached
Fourth legislature : 1994 - 1999 - Incoming Parliament (Constituent)
| Political group |
Seats |
| PES |
198 |
| EPP-ED |
156 |
| ELDR |
44 |
| GUE |
28 |
| FE |
27 |
| RDE |
26 |
| V |
23 |
| ARE |
19 |
| EDN |
19 |
| NI |
27 |
| Total |
567 |
Legend
PES : Group of the Party of European Socialists
EPP-ED : Group of the European People's Party (Christian Democrats) and European Democrats
ELDR : Group of the European Liberal, Democrat and Reform Party
GUE : Confederal Group of the European United Left
FE : Forza Europa Group
RDE : Group of the European Democratic Alliance
V : The Green Group in the European Parliament
ARE : Group of the European Radical Alliance
EDN : Europe of Nations Group (Coordination Group)
NI : Non-attached
Fourth legislature : 1994 - 1999 - Outgoing Parliament
| Political group |
Seats |
| PES |
214 |
| EPP-ED |
201 |
| ELDR |
42 |
| UPE |
34 |
| GUE-NGL |
34 |
| V |
27 |
| ARE |
21 |
| I-EDN |
15 |
| NI |
38 |
| Total |
626 |
Legend
PES : Group of the Party of European Socialists
EPP-ED : Group of the European People's Party (Christian Democrats) and European Democrats
ELDR : Group of the European Liberal, Democrat and Reform Party
UPE : Group Union for Europe
GUE/NGL : Confederal Group of the European United Left/Nordic Green Left
V : The Green Group in the European Parliament
ARE : Group of the European Radical Alliance
I-EDN : Group of Independents for a Europe of Nations
NI : Non-attached
Fifth legislature : 1999 - 2004 - Incoming Parliament (Constituent)
| Political group |
Seats |
| EPP-ED |
233 |
| PES |
180 |
| ELDR |
50 |
| GREENS/EFA |
48 |
| GUE-NGL |
42 |
| UEN |
30 |
| TDI |
18 |
| EDD |
16 |
| NI |
9 |
| Total |
626 |
Legend
EPP-ED : Group of the European People's Party (Christian Democrats) and European Democrats
PES : Group of the Party of European Socialists
ELDR : Group of the European Liberal, Democrat and Reform Party
GREENS/EFA : Group of the Greens/European Free Alliance
GUE/NGL : Confederal Group of the European United Left/Nordic Green Left
UEN : Union for Europe of the Nations Group
TDI : Technical Group of Independent Members - mixed group
EDD : Group for a Europe of Democracies and Diversities
NI : Non-attached
Fifth legislature : 1999 - 2004 - Outgoing Parliament
| Political group |
Seats |
| EPP-ED |
295 |
| PES |
232 |
| ELDR |
67 |
| GUE-NGL |
55 |
| GREENS/EFA |
47 |
| UEN |
30 |
| EDD |
18 |
| NI |
44 |
| Total |
788 |
Legend
EPP-ED : Group of the European People's Party (Christian Democrats) and European Democrats
PES : Group of the Party of European Socialists
ELDR : Group of the European Liberal, Democrat and Reform Party
GUE/NGL : Confederal Group of the European United Left/Nordic Green Left
GREENS/EFA : Group of the Greens/European Free Alliance
UEN : Union for Europe of the Nations Group
EDD : Group for a Europe of Democracies and Diversities
NI : Non-attached
Sixth legislature : 2004 - 2009 - Incoming Parliament (Constituent)
| Political group |
Seats |
| EPP-ED |
268 |
| PES |
200 |
| ALDE |
88 |
| GREENS/EFA |
42 |
| GUE-NGL |
41 |
| IND/DEM |
37 |
| UEN |
27 |
| NI |
29 |
| Total |
732 |
Legend
EPP-ED : Group of the European People's Party (Christian Democrats) and European Democrats
PES : Group of the Party of European Socialists
ALDE : Group of the Alliance of Liberals and Democrats for Europe
GREENS/EFA : Group of the Greens/European Free Alliance
GUE/NGL : Confederal Group of the European United Left/Nordic Green Left
IND/DEM : Independence/Democracy Group
UEN : Union for Europe of the Nations Group
NI : Non-attached
Sixth legislature : 2004 - 2009 - Outgoing Parliament
| Political group |
Seats |
| EPP-ED |
288 |
| PES |
217 |
| ALDE |
100 |
| UEN |
44 |
| GREENS/EFA |
43 |
| GUE-NGL |
41 |
| IND/DEM |
22 |
| NI |
30 |
| Total |
785 |
Legend
EPP-ED : Group of the European People's Party (Christian Democrats) and European Democrats
PES : Group of the Party of European Socialists
ALDE : Group of the Alliance of Liberals and Democrats for Europe
UEN : Union for Europe of the Nations Group
GREENS/EFA : Group of the Greens/European Free Alliance
GUE/NGL : Confederal Group of the European United Left/Nordic Green Left
IND/DEM : Independence/Democracy Group
NI : Non-attached
Seventh term: 2009 - 2014 - Incoming Parliament
| Political group |
Seats |
| EPP |
265 |
| S&D |
184 |
| ALDE |
84 |
| GREENS/EFA |
55 |
| ECR |
54 |
| GUE/ NGL |
35 |
| EFD |
32 |
| NA |
27 |
| Total |
736 |
Legend
EPP-ED : Group of the European People's Party (Christian Democrats) and European Democrats
PES : Group of the Party of European Socialists
ALDE : Group of the Alliance of Liberals and Democrats for Europe
GREENS/EFA : Group of the Greens/European Free Alliance
ECR : European Conservatives and Reformists Group
GUE/NGL : Confederal Group of the European United Left/Nordic Green Left
EFD : Europe of Freedom and Democracy Group
NI : Non-attached
