Year	Percent
1990	0
1995	0.01096
1996	0.02673
1997	0.0521
1998	0.10143
1999	0.49359
2000	2.21069
2001	4.68105
2002	6.38471
2003	8.00158
2004	10.23453
2005	12.70504
2006	19.45955
2007	30
2008	36
2009	38
2010	41
2011	47.5
2012	54
2013	60.5
2014	64.71366
2015	69.61624
2016	74.88
2017	80.07576