Year	Percent
2001	9.43889
2002	11.02438
2003	11.00609
2004	11.23722
2005	10.78482
2006	16.0742
2007	18.94573
2008	16.83341
2009	17.55541
2010	18.29642
2011	14.10434
2012	13.92143
2013	18.10744
2014	14.84992
2015	14.54783