Year	Percent
1995	28.14394
1996	26.73209
1997	26.51947
1998	25.43575
1999	23.89702
2000	24.83882
2001	25.39326
2002	25.55325
2003	26.13207
2004	25.52709
2005	26.36587
2006	26.94456
2007	27.05427
2008	26.2844
2009	23.38518
2010	24.47012
2011	25.5991
2012	25.12891
2013	25.18559
2014	24.92704
2015	24.02348
2016	23.12168
2017	23.52358