1988 |
83%
|
2011 |
81%
|
2001 |
76%
|
2002 |
74%
|
2004 |
79%
|
2005 |
71%
|
2007 |
73%
|
2010 |
77%
|
2009 |
76%
|
2010 |
64%
|
1995 |
76%
|
2007 |
72%
|
2006 |
78%
|
1999 |
77%
|
2005 |
63%
|
2016 |
62%
|
2013 |
72%
|