Year	Percent
1990	0.13489
1991	0.34035
1992	0.7187
1993	1.78561
1994	1.69219
1995	2.57427
1996	2.81225
1997	3.08451
1998	3.6499
1999	4.28358
2000	5.43094
2001	2.97972
2002	2.05908
2003	2.46928
2004	5.43625
2005	3.60669
2006	6.2286
2007	5.83387
2008	2.73016
2009	3.18898
2010	3.83772
2011	3.49544
2012	1.47054
2013	0.15165
2014	3.62743
2015	3.15593
2016	3.55494
2017	1.42171