Year	Percent
1995	28.36305
1996	28.08304
1997	28.02496
1998	27.84572
1999	27.85387
2000	27.88503
2001	27.89652
2002	27.77183
2003	27.46443
2004	27.10838
2005	27.28447
2006	27.05486
2007	26.47068
2008	26.61291
2009	25.38969
2010	23.82234
2011	22.94654
2012	22.03171
2013	21.24339
2014	21.10019
2015	21.42698
2016	21.2973
2017	21.61418