Year	Percent
1961	-1.30788
1962	1.60364
1963	0.9223
1964	4.73079
1965	1.71311
1966	-3.20758
1967	1.60668
1968	-1.02198
1969	1.67209
1970	3.83286
1971	3.29361
1972	2.07924
1973	10.7933
1974	8.16108
1975	7.96756
1976	4.52493
1977	-1.07966
1978	2.94652
1979	1.05558
1980	1.05901
1981	2.94455
1982	-1.8996
1983	-2.80665
1984	0.09518
1985	1.38168
1986	0.93279
1987	-2.68566
1988	3.33489
1989	-1.40565
1990	1.23746
1991	1.86975
1992	-0.2195
1993	-0.31311
1994	1.9743
1995	0.07082
1996	-0.38322
1997	2.21494
1998	1.23843
1999	-6.54343
2000	-0.74859
2001	2.20154
2002	2.35038
2003	1.04138
2004	6.44847
2005	3.56202
2006	2.66754
2007	0.47815
2008	4.57482
2009	-1.1018
2010	1.83798
2011	6.14348
2012	3.98186
2013	3.32569
2014	2.21234
2015	-1.39697
2016	-3.02224
2017	1.51255