Year	Percent
1986	2.924
1987	2.7491
1988	1.2085
1989	3.871
1990	2.703
1991	1.37
1992	3.125
1993	1.695
1996	1.333
1997	1.282
1998	1.136
1999	1.02
2000	0.952
2001	0.855
2002	0.752
2003	0.5059
2004	0.521
2005	1.471
2006	2.575
2007	0.76
2008	0.99
2009	0.932
2010	1.7
2011	1.946
2012	1.307
2013	1.037
2014	1.338
2015	1.4011
2016	1.254
2017	1.38