1991 |
74%
|
2001 |
74%
|
1993 |
74%
|
1999 |
74%
|
2001 |
74%
|
1996 |
74%
|
1992 |
74%
|
1998 |
74%
|
2002 |
74%
|
1998 |
59%
|
2000 |
62%
|
1977 |
70%
|
2003 |
56%
|
2006 |
40%
|
2005 |
55%
|
2004 |
55%
|
2005 |
55%
|
2003 |
55%
|
2007 |
55%
|
1989 |
63%
|
1996 |
68%
|
1997 |
68%
|
1996 |
63%
|
1998 |
63%
|
1997 |
63%
|
1987 |
57%
|