Year	Percent
1995	16.1
1996	15.6
1997	16.1
1998	16.1
1999	16.2
2001	15
2002	15.8
2003	16.4
2004	22.86
2005	26.21
2006	24.71
2007	21.03
2008	15.9757
2009	17.8607
2010	20.2247
2011	23.6989
2012	24.9816
2013	23.8404
2014	20.3733
2015	19.0119
2016	16.1005
2017	14.2742