Year	Percent
1994	22.78268
1995	22.39362
1996	21.68976
1997	20.93638
1998	20.18714
1999	18.09763
2000	16.99378
2001	16.08834
2002	16.87394
2003	16.74548
2004	15.70174
2005	16.51704
2006	17.18591
2007	18.12522
2008	18.16357
2009	15.93046
2010	16.54994
2011	16.69128
2012	15.96453
2013	15.56236
2014	15.50284
2015	15.60888
2016	16.20333