Year	Percent
1995	11.3
1996	11.3
1997	12.2
1998	11.8
1999	11.7
2001	11.1
2002	12.4
2003	14.4
2004	15.07
2005	16.78
2006	17.94
2007	15.79
2008	11.9166
2009	14.7865
2010	18.4499
2011	22.4249
2012	23.2736
2013	20.8674
2014	18.3313
2015	17.075
2016	14.5918
2017	12.8402