| 1991 |
44%
|
| 1988 |
54%
|
| 2003 |
43%
|
| 2008 |
39%
|
| 1994 |
41%
|
| 2005 |
41%
|
| 2009 |
31%
|
| 2015 |
54%
|
| 2012 |
59%
|
| 2009 |
63%
|
