Year	Percent
1986	1.3002
1987	0.7246
1988	2.2455
1989	3.0488
1990	1.887
1991	2.632
1992	0.699
1993	1.379
1994	1.829
1995	1.724
1996	0.515
1997	0.565
1998	0.617
1999	1.471
2000	1.786
2001	1.158
2002	1.73
2003	1.3536
2004	0.929
2005	1.445
2006	1.542
2007	0.897
2008	1.461
2009	1.581
2010	2.147
2011	1.572
2012	1.901
2013	2.133
2014	1.761
2015	1.6374
2016	1.094
2017	0.985