2005
8.7
8.5
0.2
8.7
2006
8.8
0.4
9.2
2007
9.3
0.6
9.9
2008
9.7
0.8
10.5
2009
10.9
1
11.9
2010
11.6
11.5
1.1
12.6
2011
12.3
11
11
13
0.5
13.5
2012
13
11
14.1
0.3
14.4
2013
13.7
12.1
2014
14.5
12.1
2015
15.3
13.8
2016
16.1
13.8
2017
17.2
16
2018
18.2
16
2019
19.3
2020
20.6
20
20