| 1975 |
79%
|
| 1985 |
72%
|
| 1981 |
71%
|
| 1978 |
56%
|
| 1980 |
85%
|
| 1976 |
85%
|
| 1981 |
70%
|
| 1985 |
62%
|
| 1988 |
52%
|
| 2009 |
76%
|
| 2010 |
80%
|
