1990
36.4
52.4
11.9
35.7
1991
19.9
35.2
10.8
54
1992
22
37.4
14.1
48.4
1993
31
53.3
12
34.7
1994
33.9
57.7
11.1
31.1
1995
34.9
48.1
10.4
41.5
1996
51.2
68.7
9.8
21.5
1997
59.8
79.7
11.6
8.7
1998
63.8
86.6
7.2
6.1
1999
63.7
88.3
5.1
6.5
2000
64.8
90.2
5
4.8
2001
66.9
91
4.4
4.5
2002
64.1
91.1
3.8
5.2
2003
68
92.4
2.7
5
2004
64.2
86.4
3.6
9.9
2005
63.1
85.7
3.7
10.7
2006
63.9
88.8
4.2
7.1
2007
62.6
88.7
4.4
6.9
2008
63.7
92
2.8
5.2
2009
62.2
89.4
3.1
7.4
2010
60.5
90.2
2.8
7
2011
70.4
90
2.4
7.6
2012
71.9
90.9
2.3
6.8
2013
76.5
89.7
2.4
8
2014
78.2
91.3
2.4
6.3