1979 |
74%
|
1981 |
69%
|
1980 |
65%
|
1981 |
62%
|
1982 |
63%
|
1972 |
70%
|
1977 |
68%
|
1971 |
68%
|
1988 |
54%
|
1981 |
58%
|
1987 |
51%
|
1990 |
55%
|
1987 |
50%
|
1982 |
48%
|
1983 |
52%
|
1980 |
65%
|
1984 |
55%
|
1990 |
46%
|
1988 |
51%
|
1986 |
52%
|
1989 |
57%
|
1989 |
38%
|
1976 |
56%
|