Year	Percent
1993	11.15
1994	8.2
2002	13.1521
2003	10.6879
2004	8.2159
2005	8.2494
2006	9.0189
2007	7.2345
2008	7.3571
2009	9.5392
2010	8.4927
2011	8.208
2012	7.6312
2013	8.1487
2014	8.2972
2015	10.4389
2016	9.0431
2017	9.7979