Year	Percent
1992	0.18859
1993	0.06659
1994	0.60829
1995	1.72442
1996	1.10021
1997	3.16805
1998	11.66114
1999	6.61291
2000	5.45043
2001	3.29807
2002	4.6595
2003	4.37657
2004	6.9099
2005	5.96011
2006	7.30732
2007	7.25233
2008	8.09235
2009	8.78869
2010	5.71604
2011	6.44067
2012	4.67673
2013	3.11193
2014	3.47903
2015	1.68947
2016	3.20606
2017	2.16493