Year	Percent
1993	34.83702
1994	34.78699
1995	35.34842
1996	36.72829
1997	36.17241
1998	35.15998
1999	34.14249
2000	33.87494
2001	34.28065
2002	33.26355
2003	32.62802
2004	34.08043
2005	34.08366
2006	34.68765
2007	34.59572
2008	34.16461
2009	33.24695
2010	33.259
2011	33.40823
2012	33.16392
2013	32.85041
2014	34.24586
2015	33.99186
2016	33.81569
2017	33.45742