1992 |
81%
|
1994 |
55%
|
1981 |
66%
|
1976 |
59%
|
1988 |
58%
|
1977 |
64%
|
1987 |
62%
|
1971 |
35%
|
2004 |
40%
|
1993 |
48%
|
1995 |
40%
|
1995 |
44%
|
1982 |
44%
|
1991 |
40%
|
1988 |
61%
|
1987 |
39%
|
2005 |
61%
|
2001 |
71%
|
2005 |
52%
|
1988 |
47%
|
2008 |
35%
|
1996 |
31%
|
1986 |
65%
|
1999 |
73%
|
2006 |
62%
|
2006 |
81%
|
1990 |
37%
|