Year	Percent
2000	32.1885
2001	32.6852
2002	37.0086
2003	34.4561
2004	31.4912
2005	32.2374
2006	31.9526
2007	29.085
2008	22.5716
2009	22.2925
2010	23.8743
2011	24.3124
2012	24.0363
2013	23.5993
2014	24.5576
2015	25.2489
2016	26.5745
2017	27.1991