Year	Percent
1990	0
1993	0.12783
1994	0.31851
1995	0.52321
1996	0.78329
1997	1.17338
1998	2.68981
1999	5.43776
2000	9.4268
2001	12.52832
2002	40.14
2003	43.04
2004	52.89
2005	55.19
2006	56.08
2007	61.8
2008	66.05
2009	70
2010	75.71
2011	74.44
2012	76.70999
2013	77.8826
2014	79.98
2015	77.6347
2016	80.4759
2017	81.62567