Year	Percent
1993	18.86472
1994	16.75561
1995	16.33909
1996	15.38786
1997	15.17936
1998	14.43578
1999	14.94013
2000	14.51694
2001	14.80355
2002	14.61555
2003	15.0555
2004	15.4908
2005	14.36542
2006	14.08293
2007	14.50234
2008	13.44186
2009	13.36082
2010	13.44956
2011	14.31396
2012	14.68783
2013	14.94643
2014	14.17156
2015	14.55582
2016	14.65864