| 1977 |
73%
|
| 1975 |
72%
|
| 1985 |
63%
|
| 1982 |
66%
|
| 1980 |
63%
|
| 1987 |
71%
|
| 2007 |
54%
|
| 1977 |
63%
|
| 1991 |
61%
|
| 2000 |
50%
|
