1985 |
67%
|
1983 |
71%
|
2008 |
68%
|
2010 |
68%
|
2011 |
68%
|
1988 |
49%
|
2007 |
57%
|
1998 |
38%
|
1991 |
43%
|
1993 |
42%
|
1992 |
42%
|
1979 |
44%
|
1998 |
54%
|