Year	Percent
1990	1.38
1991	1.04
1992	1.24
1993	1.26
1994	1.63
1995	1.41
1996	1.66
1997	1.54
1998	1.33
1999	1.35
2000	1.15
2001	1.09
2002	1.11
2003	1.66
2004	1.31
2005	1.03
2006	0.99
2007	0.94
2008	0.72
2009	0.72
2010	1.01
2011	0.75
2012	0.66
2013	0.64
2014	0.82
2017	0.59