Year	Percent
1961	-1.08037
1962	2.5855
1963	0.80534
1964	-1.68057
1965	-1.79705
1966	-1.00286
1967	0.3876
1968	1.87143
1969	1.69624
1970	5.00118
1971	-1.26919
1972	-1.36346
1973	14.50077
1974	15.67927
1975	13.11609
1976	11.4953
1977	16.45286
1978	5.49596
1979	8.58719
1980	10.00489
1981	8.54811
1982	4.97795
1983	6.56098
1984	4.1237
1985	18.77974
1986	41.46259
1987	7.99853
1988	11.6553
1989	10.9089
1990	40.53126
1991	32.97505
1992	8.86138
1993	14.50435
1994	11.72228
1995	8.66782
1996	8.9
1997	8.25734
1998	9.50244
1999	5.04156
2000	6.83011
2001	-4.08393
2002	6.4495
2003	4.45603
2004	6.07693
2005	5.63457
2006	4.99388
2007	7.13599
2008	9.44045
2009	3.54363
2010	5.14187
2011	6.93308
2012	3.3222
2013	3.36668
2014	3.01616
2015	3.23093
2016	3.69883
2017	3.61919