Year	Percent
2000	19.67945
2001	19.28179
2002	17.71481
2003	23.61192
2004	27.22694
2005	26.74847
2006	28.47821
2007	26.47336
2008	27.73071
2009	36.95457
2010	50.2
2011	47.39952
2012	44.8013
2013	47.01407
2014	48.52314
2015	53.09243
2016	52.8
2017	53.61446