2016 |
72%
|
2011 |
69%
|
2007 |
60%
|
2009 |
57%
|
2005 |
54%
|
2009 |
70%
|
1996 |
57%
|
2004 |
72%
|
2003 |
79%
|
1991 |
59%
|