1983 |
73%
|
1997 |
55%
|
2007 |
68%
|
1985 |
78%
|
1985 |
75%
|
1993 |
67%
|
1990 |
57%
|
1992 |
75%
|
1979 |
75%
|
1976 |
74%
|
1991 |
46%
|
1991 |
42%
|