Year	Percent
2001	14.18997
2002	12.76195
2003	18.18027
2004	17.81332
2005	17.51064
2006	16.7646
2008	14.28882
2009	14.12152
2010	18.40825
2011	16.02497
2012	18.15235
2013	19.19303
2014	28.72759
2015	30.67578
2016	32.72418