Year	Percent
1994	26.521
1995	23.086
1996	21.61
1997	22.559
1998	20.4547
1999	30.8128
2000	33.324
2001	34.4796
2002	36.283
2003	30.6624
2004	30.3789
2005	28.8048
2006	26.9598
2007	20.2091
2008	19.7973
2009	26.5039
2010	31.9451
2011	33.8224
2012	32.4982
2013	31.5801
2014	30.0846
2015	27.5289
2016	26.3247
2017	20.1798