| 1968 |
81%
|
| 1978 |
82%
|
| 2005 |
68%
|
| 1985 |
76%
|
| 1982 |
72%
|
| 2007 |
55%
|
| 2009 |
53%
|
| 1993 |
60%
|
| 1973 |
56%
|
| 1988 |
65%
|
| 1977 |
70%
|
| 1990 |
63%
|
| 2000 |
57%
|
| 1981 |
63%
|
| 1972 |
56%
|
| 1973 |
63%
|
| 1971 |
51%
|
| 1974 |
60%
|
