Year	Percent
2000	10.4224
2001	14.495
2002	14.0113
2003	19.4129
2004	17.6686
2005	16.0151
2006	14.3698
2007	11.8158
2008	9.9781
2009	12.5344
2010	11.8303
2011	12.8632
2012	14.7106
2013	10.3967
2014	9.6182
2015	9.3958
2016	10.889
2017	10.2252