1984 |
67%
|
1990 |
64%
|
1985 |
58%
|
1986 |
54%
|
1987 |
50%
|
1996 |
67%
|
1988 |
46%
|
1989 |
44%
|
1978 |
65%
|
1977 |
70%
|
1978 |
74%
|
1994 |
46%
|
1997 |
49%
|
2007 |
78%
|