Year	Percent
1993	13.56957
1994	16.46154
1995	27.24353
1996	36.33965
1997	35.05926
1998	32.25057
1999	8.19491
2002	4.01567
2004	18.0612
2005	19.81677
2006	22.57482
2007	51.00267
2008	23.09967
2009	19.01295
2010	13.69589
2011	9.4788
2012	12.19324
2013	15.65343
2014	11.04071
2015	10.38815
2016	7.36247
2017	9.90434