Year	Percent
1990	0
1997	0.24097
1998	0.47274
1999	1.15998
2000	1.82244
2001	2.68533
2002	3.51876
2003	4.32489
2004	5.31883
2005	6.07409
2006	6.80891
2007	8.28322
2008	14
2009	21
2010	30
2011	32
2012	34.74
2013	37.5
2014	40.26
2015	42.68
2016	50.32282
2017	57.16215