| 1987 |
81%
|
| 2009 |
73%
|
| 2005 |
72%
|
| 2006 |
69%
|
| 2004 |
72%
|
| 2008 |
76%
|
| 2010 |
73%
|
| 2007 |
73%
|
| 2010 |
49%
|
| 2011 |
44%
|
