Year	%
2008	7.8723935463483
2009	9.09665946603969
2010	9.1132626860378
2011	8.02868558600608
2012	8.46235298163152
2013	7.91002963151823
2014	7.89299433510758
2015	8.33527954047096
2016	8.52734577902533
2017	8.37412119960357
2018	8.04086712352321
2019	8.23996458301581