Year	Percent
1994	10.41
1995	10.017
1996	8.148
1997	8.867
1998	9.4204
1999	12.8192
2000	15.8378
2001	16.2987
2002	15.0517
2003	14.1511
2004	15.0252
2005	13.2873
2006	10.4798
2007	8.6516
2008	7.4107
2009	9.995
2010	12.4063
2011	11.7576
2012	11.4859
2013	12.1898
2014	11.5139
2015	9.0511
2016	7.6845
2017	7.2928