2000
30.5
17.7
21.4
2001
27.9
30.0
18.4
2002
29.1
19.2
20.9
2003
41.3
58.2
27.2
2004
25.5
20.2
19.7
2005
32.8
23.6
20.3
2006
13.4
38.2
45.2
17.7
2007
4.2
28.4
21.0
19.4
2008
7.5
22.9
15.4
11.8
2009
7.4
23.9
15.0
14.9
2010
9.6
24.9
16.7
13.1
2011
13.9
30.2
14.7
11.9
2012
11.0
21.5
14.2
8.0