%
30
25
20
15
10
5
0
24.1%
4.1%
2001
23.4%
4.3%
24.5%
4.8%
2003
27.5%
4.9%
29.1%
5.6%
2005
29.5%
6.3%
29.3%
7.4%
2007
28.9%
9.0%
26.5%
10.6%
2009
25.4%
11.7%
24.7%
11.2%
2011
23.7%
11.2%
21.1%
11.5%
2013
18.3%
12.3%
17.5%
14.7%
2015
16.6%
15.4%
15.3%
16.9%
2017
15.9%
16.6%
US
China