Year	Percent
1986	1.6
1987	1.04
1988	1.04
1989	1.1
1990	1.88
1991	1.94
1992	1.85
1993	1.64
1994	1.63
1995	1.56
1996	1.81
1997	1.35
1998	1.4
1999	1.29
2000	1.26
2001	1.21
2002	1.06
2003	0.94
2004	0.84
2005	0.88
2006	1.28
2007	1.52
2008	1.25
2009	1.37
2010	1.4
2011	1.43
2012	1.4
2013	1.47
2014	1.37
2015	1.1
2016	1.02
2017	0.96