Year	Percent
1999	39.0179
2000	37.27151
2001	35.74196
2002	35.85259
2003	35.35128
2004	34.62936
2005	32.91852
2006	32.03604
2007	30.50613
2008	31.10585
2009	37.05012
2010	36.80425
2011	36.27448
2012	36.00609
2013	35.332
2014	35.61927