1991 |
85%
|
1997 |
70%
|
1999 |
66%
|
1985 |
67%
|
1996 |
61%
|
2002 |
72%
|
2000 |
45%
|
1993 |
66%
|
1983 |
75%
|
1984 |
75%
|
1999 |
74%
|
1994 |
67%
|
1999 |
56%
|
1980 |
70%
|
1979 |
70%
|
1978 |
70%
|
1981 |
70%
|
1983 |
71%
|
1980 |
71%
|
1997 |
30%
|
2005 |
74%
|
1993 |
60%
|
1970 |
61%
|
1968 |
79%
|
1971 |
79%
|
1972 |
79%
|
1990 |
63%
|
1995 |
43%
|
1990 |
59%
|
1995 |
43%
|
1997 |
68%
|
1998 |
68%
|
2000 |
68%
|
1999 |
68%
|
2000 |
67%
|
1988 |
57%
|
2008 |
41%
|
1986 |
48%
|
2004 |
34%
|
1997 |
63%
|
1998 |
63%
|
1996 |
57%
|
2003 |
62%
|
1993 |
33%
|
1991 |
46%
|
1981 |
61%
|