| 1971 |
53%
|
| 1973 |
55%
|
| 1981 |
59%
|
| 1970 |
41%
|
| 1968 |
56%
|
| 1972 |
37%
|
| 1973 |
55%
|
| 1975 |
53%
|
| 1983 |
58%
|
| 1972 |
55%
|
| 2004 |
55%
|
| 1983 |
58%
|
| 1988 |
54%
|
| 1997 |
45%
|
