Year	Percent
1961	1.62165
1962	7.14811
1963	6.29664
1964	-2.73319
1965	3.87946
1966	-3.19768
1967	-2.69492
1968	-2.42642
1969	-8.11535
1970	0.20614
1971	2.77748
1972	-7.75683
1973	-19.31393
1974	5.78323
1975	-5.49587
1976	-2.15455
1977	4.70287
1978	10.23178
1979	4.08735
1980	-5.01415
1981	-2.2491
1982	-1.26613
1983	-7.45694
1984	-19.18247
1985	4.67614
1986	3.35881
1987	-2.75696
1988	3.83284
1989	-2.03786
1990	-4.2887
1991	-0.71869
1992	-9.53926
1993	-1.91206
1994	0.489
1995	-0.91901
1996	-0.18933
1997	-0.88073
1998	6.48417
1999	-4.12247
2000	-4.92783
2001	3.29215
2002	-0.66336
2003	1.54896
2004	-3.48507
2005	0.729
2006	1.95481
2007	-0.62447
2008	5.55645
2009	-4.38802
2010	4.33372
2011	-1.55196
2012	7.64245
2013	1.29943
2014	3.47543
2015	0.41125
2016	0.98702
2017	0.96605