Year	Percent
2002	7.7816
2004	7.97078
2005	7.43949
2006	9.72858
2007	9.91764
2009	15.70692
2010	17.08411
2011	17.80046
2013	15.56361
2014	13.02274
2015	13.45709
2016	12.82409