Year	Percent
1993	12.89751
1994	16.51075
1995	17.23298
1996	19.92203
1997	47.3282
1998	31.17908
1999	26.5902
2000	21.41422
2001	20.88781
2002	25.61687
2003	33.54092
2004	38.09993
2005	49.12479
2006	43.27184
2007	63.4004
2008	33.80482
2009	46.43472
2010	48.2858
2011	39.54118
2012	39.49878
2013	46.57603
2014	46.66011
2015	59.6809
2016	34.84543
2017	29.32007