| 1997 |
89%
|
| 1980 |
79%
|
| 2015 |
77%
|
| 1994 |
66%
|
| 2006 |
71%
|
| 2000 |
72%
|
| 1999 |
67%
|
| 2001 |
64%
|
| 1977 |
64%
|
| 1991 |
46%
|
| 2008 |
40%
|
| 1996 |
64%
|
| 2006 |
32%
|
