Year	Percent
1993	12.14636
1994	16.30352
1995	25.27555
1996	31.7083
1997	36.73481
1998	41.15614
1999	53.80889
2000	51.39535
2001	64.20973
2002	69.45273
2003	68.73102
2004	57.17529
2005	38.53983
2006	31.94963
2007	31.72651
2008	29.21822
2009	54.76721
2010	64.87376
2011	70.54379
2012	69.17507
2013	73.52651
2014	70.39432
2015	81.43007
2016	92.42558