Year	Percent
1992	0.04109
1993	0.1081
1994	0.07032
1995	0.10521
1996	0.70815
1997	2.4886
1998	1.33491
1999	3.65779
2000	0.93273
2001	0.77541
2002	1.69313
2003	0.96366
2004	0.70773
2005	1.01498
2006	0.96633
2007	3.99162
2008	3.60068
2009	3.81329
2010	2.43506
2011	6.4808
2012	2.22821
2013	2.97386
2014	2.36253
2015	2.92677
2016	2.61281
2017	2.34431