Year	Percent
1990	0.952
1991	0.418
1992	0.449
1993	0.595
1994	0.655
1995	0.42
1996	0.383
1997	0.806
1998	0.589
1999	0.188
2000	0.454
2001	0.449
2002	1.245
2003	1.094
2004	0.813
2005	0.592
2006	0.753
2007	1.0231
2008	0.9982
2009	1.4155
2010	1.2007
2011	1.3569
2012	1.5576
2013	2.1899
2014	2.3204
2015	3.3251
2016	2.9858
2017	3.1267