| 1978 |
65%
|
| 1985 |
48%
|
| 1978 |
70%
|
| 1981 |
71%
|
| 1985 |
71%
|
| 1987 |
37%
|
| 1983 |
51%
|
| 1987 |
39%
|
| 1990 |
37%
|
