Year	Percent
1983	0.57732
1984	0.73117
1985	1.176
1986	1.37387
1987	1.19933
1988	0.19362
1989	1.23575
1990	2.14859
1991	1.08718
1992	0.41517
1993	0.6457
1994	1.25841
1995	1.21367
1996	1.32477
1997	2.54999
1998	3.27038
1999	4.28612
2000	8.48389
2001	3.50464
2002	2.73974
2003	5.58805
2004	1.80186
2005	0.65206
2006	12.47578
2007	10.14523
2008	0.53953
2009	8.80111
2010	3.02694
2011	2.96814
2012	5.97917
2013	-3.62038
2014	2.96159
2015	17.06072
2016	9.04342
2017	5.57735