1977 |
86%
|
1996 |
72%
|
1989 |
74%
|
1988 |
72%
|
1983 |
75%
|
1995 |
56%
|
1980 |
68%
|
1973 |
76%
|
1983 |
50%
|
1990 |
68%
|
1981 |
69%
|
1981 |
66%
|
2006 |
76%
|
1985 |
62%
|
1972 |
64%
|
1970 |
75%
|
1966 |
66%
|
1961 |
65%
|
1964 |
64%
|
1971 |
68%
|
1981 |
59%
|
1962 |
64%
|
1968 |
55%
|
1974 |
53%
|
1961 |
45%
|
1968 |
46%
|
1976 |
33%
|