Year	Percent
1992	0.66125
1993	1.01887
1994	1.51486
1995	2.04719
1996	2.3043
1997	2.98083
1998	3.37567
1999	3.981
2000	3.21582
2001	2.3484
2002	2.04361
2003	2.16604
2004	2.11651
2005	2.00681
2006	2.01642
2007	1.66876
2008	1.60487
2009	1.74969
2010	1.73816
2011	1.69779
2012	1.31392
2013	1.35808
2014	1.25231
2015	1.36455
2016	1.47591
2017	1.37687