2006 |
78%
|
2011 |
81%
|
1979 |
86%
|
2001 |
76%
|
2010 |
77%
|
2008 |
61%
|
2004 |
65%
|
2008 |
70%
|
2006 |
78%
|
2011 |
71%
|
2011 |
60%
|
2005 |
63%
|
2009 |
62%
|
1978 |
62%
|
2005 |
76%
|
2007 |
66%
|
1990 |
54%
|
1975 |
53%
|