Year	Percent
1990	0.07165
1991	0.02456
1992	0.03388
1993	0.07095
1995	0.04115
1996	0.03251
1997	0.08787
1998	0.11424
1999	0.31356
2000	0.3879
2001	0.29718
2002	0.67451
2003	1.21154
2004	1.16317
2005	1.38031
2006	1.44746
2007	1.38316
2008	1.85117
2009	1.71466
2010	1.68522
2011	1.75988
2012	1.66611
2013	1.88313
2014	1.41369
2015	1.55734
2016	1.90816