| 1960 |
83%
|
| 1974 |
72%
|
| 1983 |
66%
|
| 1986 |
55%
|
| 1990 |
54%
|
| 1984 |
64%
|
| 2006 |
67%
|
| 1979 |
62%
|
| 2000 |
72%
|
| 2001 |
58%
|
| 1990 |
50%
|
