2023
51%
42%
7%
2019
58%
33%
9%
2015
61%
31%
8%
2011
59%
31%
10%
2007
69%
24%
6%
2003
73%
27%
0,5%
1999
69%
31%
0%
1995
68%
32%
0,4%
1991
79%
12%
9%
1987
65%
3,7%
31%