1979 |
61%
|
2015 |
56%
|
2005 |
42%
|
1981 |
26%
|
1974 |
38%
|
1978 |
49%
|
1975 |
57%
|
1985 |
60%
|
1981 |
62%
|
1975 |
59%
|
1991 |
68%
|
1980 |
56%
|
2016 |
59%
|
1986 |
58%
|
1987 |
56%
|
1980 |
59%
|
1985 |
56%
|
1991 |
54%
|
1986 |
51%
|
1990 |
56%
|
1989 |
59%
|
1986 |
63%
|
1993 |
55%
|
1975 |
65%
|
1983 |
61%
|
1975 |
46%
|
1998 |
67%
|
1976 |
53%
|
1975 |
53%
|
1992 |
70%
|
1990 |
64%
|
1988 |
63%
|
1987 |
54%
|
1990 |
41%
|
1987 |
--
|
2005 |
--
|