1980 |
55%
|
1979 |
63%
|
1982 |
23%
|
1981 |
53%
|
1977 |
50%
|
1982 |
32%
|
1977 |
52%
|
1988 |
35%
|
1991 |
28%
|
1980 |
47%
|
1981 |
34%
|
1983 |
52%
|
1976 |
43%
|
1982 |
45%
|
1977 |
48%
|
1990 |
27%
|
1978 |
44%
|
1976 |
43%
|
1990 |
32%
|
1986 |
42%
|
1978 |
41%
|
1977 |
40%
|
1997 |
63%
|
1980 |
38%
|
1991 |
44%
|
1995 |
51%
|
1995 |
49%
|
1983 |
37%
|
1978 |
54%
|
1998 |
56%
|
1997 |
58%
|
1998 |
52%
|
1997 |
49%
|