Year	Percent
1994	13.295
1995	12.558
1996	10.236
1997	11.109
1998	11.8943
1999	15.9808
2000	19.4399
2001	20.0816
2002	18.6707
2003	16.9818
2004	17.7391
2005	15.4625
2006	12.2758
2007	9.9017
2008	8.36
2009	11.3852
2010	14.2024
2011	13.6102
2012	13.5171
2013	13.9751
2014	12.8236
2015	10.3245
2016	8.7723
2017	7.9007