Year	Percent
1995	33.56446
1996	32.24627
1997	31.50049
1998	31.26822
1999	30.30283
2000	28.88337
2001	27.47639
2002	26.72421
2003	27.52485
2004	28.96978
2005	28.82546
2006	29.02805
2007	28.97083
2008	29.10793
2009	29.80561
2010	29.17696
2011	29.83239
2012	29.74338
2013	28.62197
2014	29.44186
2015	30.27117
2016	29.83724
2017	27.88386