1988 |
71%
|
1967 |
74%
|
1965 |
74%
|
1968 |
74%
|
1977 |
65%
|
1973 |
79%
|
1975 |
79%
|
1968 |
81%
|
1977 |
59%
|
1980 |
67%
|
1989 |
48%
|