1981 |
85%
|
1993 |
74%
|
1989 |
64%
|
1987 |
54%
|
1974 |
51%
|
1990 |
59%
|
1990 |
49%
|
1978 |
52%
|
1972 |
59%
|
1975 |
58%
|