Year	Percent
1992	1.24
1993	1.14
1994	1.1
1995	1.12
1996	1.08
1997	1.19
1998	0.79
1999	0.77
2000	0.69
2001	0.68
2002	0.63
2003	0.51
2004	0.4
2005	0.44
2006	0.5
2007	0.45
2008	0.34
2009	0.41
2010	0.33
2011	0.42
2012	0.39
2013	0.34
2014	0.32
2015	0.27
2016	0.3
2017	0.28