| 1997 |
34%
|
| 2009 |
61%
|
| 1987 |
72%
|
| 1985 |
61%
|
| 1986 |
69%
|
| 2008 |
45%
|
| 1999 |
55%
|
| 2010 |
50%
|
| 1988 |
53%
|
| 1990 |
55%
|
| 1994 |
28%
|
