Year	Percent
1993	0.89489
1994	3.40703
1995	10.56252
1996	14.07298
1997	12.8517
1998	15.93913
1999	28.4166
2000	31.78421
2001	28.21059
2002	28.91189
2003	28.40373
2004	27.18347
2005	19.37216
2006	15.28842
2007	13.96048
2008	10.25951
2009	11.13798
2010	14.3953
2011	11.86328
2012	15.71447
2013	14.28159
2014	16.12831
2015	25.89046
2016	39.81687