Year	Percent
1992	1.82
1993	1.66
1994	1.6
1995	1.66
1996	1.6
1997	1.76
1998	1.12
1999	1.07
2000	1
2001	0.94
2002	0.98
2003	0.7
2004	0.62
2005	0.67
2006	0.77
2007	0.69
2008	0.44
2009	0.48
2010	0.45
2011	0.63
2012	0.53
2013	0.47
2014	0.4
2015	0.27
2016	0.39
2017	0.46