Year	Percent
1990	0.73
1991	0.56
1992	0.74
1993	0.71
1994	1.04
1995	0.98
1996	0.96
1997	1.02
1998	0.77
1999	0.9
2000	0.69
2001	0.62
2002	0.78
2003	1.1
2004	0.81
2005	0.56
2006	0.56
2007	0.59
2008	0.38
2009	0.4
2010	0.67
2011	0.47
2012	0.45
2013	0.37
2014	0.5
2017	0.3