Year	Percent
1961	11.81249
1962	1.03056
1963	4.12021
1964	6.35482
1965	-0.31506
1966	3.21003
1967	1.38061
1968	4.58722
1969	2.03182
1970	2.64221
1971	-0.05558
1972	4.42908
1973	0.22344
1974	2.302
1975	0.02957
1976	4.93531
1977	7.6417
1978	8.51827
1979	2.13763
1980	-2.5338
1981	2.58541
1982	2.13669
1983	-11.73627
1984	-7.13884
1985	-5.36863
1986	-4.35377
1987	-5.45541
1988	-4.68682
1989	-1.54049
1990	0.82089
1991	2.01356
1992	-2.24965
1993	-2.00149
1994	3.07628
1995	4.26663
1996	6.84816
1997	7.32549
1998	7.96493
1999	7.8341
2000	6.63081
2001	3.80863
2002	7.47577
2003	13.8875
2004	7.40731
2005	5.68496
2006	12.66858
2007	4.26485
2008	2.91001
2009	-4.84244
2010	2.81904
2011	-0.79393
2012	0.78056
2013	0.48203
2014	-0.71206
2015	1.09925
2016	-6.29259
2017	-2.63297