Year	Percent
1983	5.07
1984	2.64
1986	1.02
1988	1.37
1989	1.17
1990	1.45
1991	1.48
1992	2.02
1993	0.73
1994	1.62
1995	0.97
1996	3.156
1997	2.06
1998	1.466
1999	3.927
2000	4.344
2001	3.101
2002	3.893
2003	3.437
2004	2.614
2005	2.822
2006	3.723
2007	2.519
2008	2.941
2009	4.312
2010	3.4445
2011	3.0912
2012	2.4829
2013	2.3635
2014	3.3682
2015	2.7003
2016	2.7845
2017	2.8175