1994 |
73%
|
1989 |
54%
|
1984 |
60%
|
1978 |
70%
|
2006 |
39%
|
2000 |
49%
|
2005 |
41%
|
1987 |
46%
|
1995 |
43%
|
2006 |
74%
|