| 1980 |
81%
|
| 2007 |
59%
|
| 1979 |
69%
|
| 1980 |
62%
|
| 1979 |
51%
|
| 1988 |
57%
|
| 2011 |
45%
|
| 2015 |
30%
|
| 2012 |
52%
|
| 1995 |
40%
|
| 2009 |
40%
|
| 1991 |
54%
|
| 2005 |
52%
|
| 1989 |
44%
|
