Year	Percent
1983	3.0379
1984	0.9245
1985	0.3486
1986	1.7409
1987	0.9005
1988	0.778
1989	0.5026
1990	1.3999
1991	0.872
1992	0.6961
1993	3.6271
1994	1.6312
1995	1.6615
1996	1.6396
1997	1.2164
1998	1.5275
1999	1.3838
2000	1.7527
2001	0.9195
2002	1.2243
2003	1.0317
2004	1.7091
2005	1.1168
2006	0.9595
2007	0.541
2008	1.1845
2009	0.6678
2010	1.1404
2011	0.9797
2012	1.311
2013	1.6267
2014	1.2837
2015	1.4717
2016	1.4735
2017	1.487