High-income economies
Low- and middle-income economies
2007
61.94
3.09
2008
60.91
3.32
2009
62.46
3.57
2010
63.92
4.25
2011
66.85
4.99
2012
69.1
5.52
2013
71
6.28
2014
70.42
6.71
2015
68.11
6.2
2016
68.42
6.44
2017
75.72
7.07