Year	Percent
1990	1.4768
1991	2.98945
1992	3.36883
1993	3.10972
1994	2.50355
1995	1.5848
1996	1.32163
1997	1.44026
1998	1.66611
1999	1.58355
2000	1.24077
2001	0.94957
2002	0.82363
2003	0.65968
2004	0.46527
2005	0.43934
2006	0.40468
2007	0.3036
2008	0.33359
2009	0.74937
2010	0.93207
2011	1.02746
2012	1.0704
2013	0.9097
2014	0.85518
2015	0.8462
2016	0.89009
2017	0.89887