1984 |
67%
|
1981 |
85%
|
1985 |
58%
|
1986 |
54%
|
1987 |
50%
|
1983 |
75%
|
1988 |
46%
|
1994 |
35%
|
1989 |
44%
|
1994 |
67%
|
1998 |
66%
|
1980 |
71%
|
1984 |
67%
|
1994 |
72%
|
1995 |
72%
|
1997 |
72%
|
1996 |
72%
|
1995 |
75%
|
1997 |
49%
|
1983 |
56%
|
1990 |
73%
|
1997 |
52%
|
2000 |
36%
|