Year	Percent
1992	2.24347
1993	2.70897
1994	3.21766
1995	3.37562
1996	3.48125
1997	3.61776
1998	3.69392
1999	3.46258
2000	3.28534
2001	2.88962
2002	2.66996
2003	2.58729
2004	1.97244
2005	1.88797
2006	1.65836
2007	1.42909
2008	1.60056
2009	2.00784
2010	2.37734
2011	2.48277
2012	3.33052
2013	4.10915
2014	4.3377
2015	4.11302
2016	3.89096
2017	3.77535