1990 |
87%
|
1996 |
67%
|
1984 |
67%
|
1974 |
79%
|
1978 |
75%
|
1980 |
75%
|
1979 |
75%
|
1977 |
75%
|
1975 |
75%
|
1984 |
75%
|
1976 |
75%
|
1982 |
75%
|
1981 |
75%
|
1975 |
75%
|
2007 |
58%
|