1997 |
50%
|
2018 |
53%
|
2007 |
66%
|
2006 |
66%
|
1993 |
68%
|
2015 |
73%
|
2017 |
73%
|
2018 |
73%
|
2011 |
61%
|
1990 |
70%
|
1991 |
63%
|
1991 |
63%
|
1990 |
63%
|
1991 |
66%
|
2017 |
48%
|
2012 |
63%
|
1996 |
58%
|
1997 |
58%
|
1996 |
58%
|
2015 |
60%
|
2014 |
58%
|
2016 |
57%
|
1990 |
62%
|
1994 |
52%
|