| 1976 |
82%
|
| 2000 |
92%
|
| 1997 |
77%
|
| 1987 |
70%
|
| 1973 |
76%
|
| 1979 |
75%
|
| 1987 |
69%
|
| 1999 |
68%
|
| 1982 |
65%
|
| 1982 |
63%
|
| 2006 |
51%
|
| 1988 |
54%
|
| 2008 |
51%
|
| 1982 |
52%
|
| 1983 |
47%
|
| 2001 |
57%
|
| 2007 |
58%
|
| 2010 |
77%
|
| 2011 |
39%
|
