Year	Percent
1961	1.68348
1962	0.87239
1963	3.84675
1964	5.25829
1965	-4.63466
1966	-2.1125
1967	5.5967
1968	1.22688
1969	4.26968
1970	2.86377
1971	-0.6272
1972	-2.81659
1973	0.91849
1974	-1.14679
1975	6.64622
1976	-0.65072
1977	4.82877
1978	3.3271
1979	-7.38325
1980	4.30515
1981	3.57805
1982	1.10103
1983	4.83544
1984	1.4711
1985	2.90843
1986	2.48029
1987	1.7237
1988	7.30296
1989	3.73699
1990	3.3669
1991	-0.98255
1992	3.3907
1993	2.70614
1994	4.60472
1995	5.52729
1996	5.5268
1997	2.11863
1998	4.24371
1999	6.89248
2000	2.01556
2001	3.02124
2002	2.05812
2003	6.08669
2004	6.18757
2005	7.56712
2006	7.58463
2007	8.15357
2008	2.37525
2009	6.95004
2010	8.76318
2011	5.24854
2012	4.13472
2013	5.09669
2014	6.14033
2015	6.89904
2016	5.88984
2017	5.42924