Year	Percent
1992	0.34022
1993	0.23488
1994	0.07113
1995	0.15296
1996	0.23537
1997	0.78654
1998	0.46862
1999	1.12688
2000	1.224
2001	0.82877
2002	1.02363
2003	2.25956
2004	2.33192
2005	2.34022
2006	3.02982
2007	3.44703
2008	3.35146
2009	3.53991
2010	3.45044
2011	3.25837
2012	2.2089
2013	3.76586
2014	2.76606
2015	1.61393
2016	1.73689
2017	2.47534