1979 |
75%
|
1985 |
66%
|
1986 |
56%
|
1984 |
71%
|
1988 |
66%
|
1989 |
81%
|
1988 |
52%
|
1991 |
48%
|
1978 |
54%
|
1990 |
63%
|