Year	Percent
1992	1.44261
1993	1.76766
1994	1.94125
1995	1.9293
1996	1.93595
1997	2.04455
1998	2.45409
1999	2.65533
2000	2.5142
2001	2.18252
2002	2.24086
2003	2.18719
2004	2.23505
2005	1.99582
2006	2.00786
2007	1.60801
2008	1.53193
2009	1.90954
2010	2.96557
2011	4.79333
2012	7.7188
2013	9.66116
2014	9.56973
2015	8.79271
2016	7.87877
2017	7.08015