1991 |
85%
|
2003 |
60%
|
1995 |
79%
|
2006 |
57%
|
1984 |
75%
|
1979 |
70%
|
1984 |
71%
|
1987 |
60%
|
2009 |
41%
|
2000 |
37%
|
1989 |
53%
|
1989 |
48%
|
1987 |
57%
|
1997 |
47%
|