Year	Percent
1990	0
1997	0.01639
1998	0.02406
1999	0.1177
2000	0.2301
2001	0.29957
2002	1.02299
2003	1.3542
2004	1.80814
2005	1.90137
2006	2.0572
2007	2.2063
2008	2.35489
2009	2.30328
2010	2.45
2011	2.672
2012	2.89399
2013	3.1
2014	3.32
2015	3.54071
2016	3.76141