Year	Percent
1971	-5.82003
1972	4.18938
1973	-0.86744
1974	2.83709
1975	6.52604
1976	4.1825
1977	-7.47661
1978	12.87626
1979	1.48357
1980	-16.83337
1981	16.18677
1982	1.92741
1983	-5.82376
1984	6.2772
1985	1.54516
1986	-3.17458
1987	0.50191
1988	2.20363
1989	3.65519
1990	3.60965
1991	2.57929
1992	-1.33951
1993	-0.31695
1994	0.88566
1995	2.23501
1996	9.4877
1997	4.63428
1998	-29.30966
1999	-0.70228
2000	3.52448
2001	0.23117
2002	-2.97623
2003	-1.53839
2004	0.54362
2005	1.96359
2006	0.00407
2007	0.88562
2008	0.77248
2009	0.8753
2010	2.02696
2011	5.3576
2012	-4.23176
2013	0.59353
2014	-1.62422
2015	3.44963
2016	3.61914
2017	3.3249