Year	Percent
1995	33.08571
1996	33.9724
1997	31.34997
1998	31.21041
1999	30.76113
2000	32.21249
2001	31.53663
2002	30.87264
2003	31.57518
2004	32.43203
2005	32.05267
2006	34.81472
2007	34.12353
2008	34.43344
2009	30.76943
2010	31.98932
2011	32.17182
2012	32.30975
2013	30.10425
2014	31.32302
2015	31.1426
2016	31.43744
2017	30.96872