Year	Percent
1994	34.70301
1995	34.41468
1996	34.4996
1997	34.11013
1998	33.54739
1999	33.03947
2000	32.75826
2001	31.26985
2002	30.53965
2003	30.4154
2004	30.29861
2005	30.19939
2006	29.98259
2007	29.8825
2008	29.00529
2009	27.27247
2010	28.44461
2011	26.88171
2012	26.74805
2013	26.93763
2014	27.68806
2015	28.89782
2016	29.30046