Year	Percent
1984	3.00142
1985	2.36146
1986	3.66412
1987	3.22069
1988	2.38834
1989	4.19527
1990	3.72328
1991	2.55383
1992	2.95558
1993	1.56191
1994	1.87861
1995	1.58919
1996	1.15695
1997	1.10891
1999	1.792
2004	1.67029
2005	1.84808
2006	1.74414
2007	2.06349
2008	2.08021
2009	1.73164
2010	1.38259
2011	1.26233
2012	1.39367
2013	1.43443
2014	1.66187
2015	1.78555
2016	1.45076
2017	1.34152