Year	Percent
1992	1.79224
1993	2.35503
1994	2.76583
1995	2.61103
1996	2.64267
1997	3.00923
1998	3.08139
1999	2.60839
2000	2.32479
2001	2.21514
2002	2.27246
2003	2.74175
2004	2.96064
2005	3.31761
2006	3.26787
2007	2.76528
2008	2.29437
2009	2.09107
2010	1.83095
2011	1.5774
2012	1.39065
2013	1.35721
2014	1.24482
2015	1.13263
2016	0.95316
2017	0.86864