°Strength of the political parties
	Left and center parties, in %					Right Parties, in %
	SPS	EVP/LdU/Grün-liberale/CSP	extreme left parties*	GPS		FDP	CVP	SVP	extreme right parties
1971	22.9	10.1	3.0	0.0		21.7	20.3	11.1	7.5
1975	24.9	8.2	3.7	0.1		22.2	21.1	9.9	5.8
1979	24.4	6.3	4.4	0.6		24.0	21.3	11.6	2.2
1983	22.8	6.5	4.6	1.9		23.3	20.2	11.1	3.8
1987	18.4	6.4	5.1	4.9		22.9	19.6	11.0	6.3
1991	18.5	5.1	3.0	6.1		21.0	18.0	11.9	10.9
1995	21.8	3.9	2.7	5.0		20.2	16.8	14.9	9.3
1999	22.5	3.0	1.7	5.0		19.9	15.9	22.6	4.8
2003	23.3	3.0	1.7	7.4		17.3	14.4	26.7	2.9
2007	19.5	2.6	0.4	9.6		15.6	14.6	29.0	2.4
	Cumulated voter percent-age of the governmental parties	Number of parties
1971	76.0	10
1975	78.1	11
1979	81.3	16
1983	77.4	15
1987	71.9	15
1991	69.4	18
1995	73.7	15
1999	80.9	15
2003	81.7	14
2007	78.7	12