Year	Percent
1992	2.60601
1993	2.73079
1994	2.42801
1995	1.7615
1996	1.80616
1997	1.45707
1998	1.29761
1999	1.10301
2000	0.97259
2001	0.88327
2002	0.77205
2003	1.05551
2004	1.14179
2005	1.03108
2006	0.76339
2007	0.60887
2008	0.41861
2009	0.64069
2010	1.08687
2011	1.48281
2012	1.68314
2013	1.5713
2014	1.35759
2015	1.32279
2016	1.28182
2017	1.06247