Year	Percent
1993	0.85959
1994	5.39995
1995	4.79395
1996	12.00271
1997	16.79886
1998	11.17253
1999	18.10739
2000	7.96255
2001	4.2427
2002	6.09361
2003	6.24003
2004	5.94277
2005	5.71056
2006	6.79033
2007	8.0032
2008	7.20657
2009	10.90228
2010	10.4259
2011	9.28658
2012	10.0122
2013	14.04167
2014	15.04785
2015	16.24006
2016	20.66399
2017	22.01071