| 1998 |
69%
|
| 2009 |
57%
|
| 1986 |
71%
|
| 1995 |
64%
|
| 1993 |
72%
|
| 1991 |
61%
|
| 1992 |
63%
|
| 1980 |
50%
|
| 1996 |
41%
|
| 1998 |
38%
|
| 1996 |
38%
|
| 1993 |
42%
|
| 1994 |
43%
|
