Year	Percent
1995	33.39826
1996	30.80118
1997	28.62964
1998	29.2759
1999	27.84688
2000	30.76625
2001	29.3715
2002	27.70041
2003	26.95718
2004	25.43008
2005	24.45021
2006	24.35888
2007	23.50084
2008	24.09013
2009	24.01727
2010	23.67913
2011	24.83892
2012	25.39404
2013	26.65039
2014	25.18794
2015	25.95284
2016	25.79884
2017	26.38012