Year	Percent
1976	0.2736
1977	0.19303
1978	0.32732
1979	0.11027
1980	0.6694
1981	1.54014
1982	1.13323
1983	-0.85872
1984	0.48547
1985	0.80276
1986	0.21626
1987	0.04413
1988	-0.246
1989	-0.49029
1990	0.34748
1991	0.27123
1992	-0.18679
1993	0.00345
1994	-0.02181
1995	-0.13268
1996	1.13713
1997	1.95811
1998	1.77142
1999	0.73343
2000	1.73808
2001	2.00884
2002	0.99814
2003	2.96343
2004	5.50409
2005	18.53448
2006	22.7382
2007	32.23352
2008	6.81651
2009	0.49125
2010	1.93067
2011	7.51363
2012	7.16605
2013	3.0396
2014	4.4312
2015	6.76278
2016	-5.25158
2017	-29.3746