2012 |
57%
|
2015 |
56%
|
1978 |
49%
|
1985 |
60%
|
1981 |
63%
|
1991 |
68%
|
1978 |
54%
|
1979 |
56%
|
2016 |
59%
|
1985 |
62%
|
1988 |
67%
|
1977 |
58%
|
1978 |
58%
|
1981 |
63%
|
1987 |
53%
|
1988 |
59%
|
1983 |
57%
|
1986 |
63%
|
1987 |
54%
|
1978 |
71%
|
1987 |
--
|
2005 |
--
|