Year	Percent
1993	7.07
1994	7.35
2002	22.5148
2003	18.3462
2004	18.0436
2005	14.584
2006	14.959
2007	16.2942
2008	13.8414
2009	16.1805
2010	15.4309
2011	16.9836
2012	13.8842
2013	11.8929
2014	15.7766
2015	12.0942
2016	15.4787
2017	12.613