| 1977 |
86%
|
| 2016 |
78%
|
| 1999 |
67%
|
| 2004 |
65%
|
| 1995 |
56%
|
| 2005 |
66%
|
| 1980 |
68%
|
| 2006 |
56%
|
| 1988 |
64%
|
| 1975 |
65%
|
| 2006 |
76%
|
| 2009 |
45%
|
| 1999 |
38%
|
