Year	Percent
1990	0.21416
1991	0.4065
1992	0.91895
1993	1.76514
1994	2.25994
1995	1.93394
1996	2.55155
1997	2.75461
1998	2.482
1999	1.74742
2000	1.26753
2001	0.84853
2002	0.93868
2003	0.9912
2004	1.33414
2005	0.31077
2006	0.81875
2007	0.96769
2008	0.90366
2009	1.42969
2010	1.73274
2011	1.52522
2012	1.51736
2013	1.51888
2014	1.49637
2015	1.42478
2016	1.31397
2017	1.28163