Year	Percent
1993	0.72117
1994	0.80895
1995	0.95502
1996	0.91948
1997	1.14599
1998	1.65859
1999	2.65936
2000	3.07524
2001	2.8312
2002	2.5158
2003	2.60348
2004	2.86942
2005	2.86522
2006	2.66746
2007	1.88334
2008	1.50399
2009	1.77751
2010	2.35627
2011	2.04987
2012	2.18167
2013	2.22621
2014	1.9175
2015	1.65434
2016	1.19519
2017	0.80748