Year	Percent
1961	-4.24012
1962	3.04751
1963	3.70103
1964	-2.47877
1965	2.75322
1966	-5.57303
1967	4.60953
1968	8.92237
1969	-0.05427
1970	1.87372
1971	6.63537
1972	11.10992
1973	21.1827
1974	57.51167
1975	24.57146
1976	7.99564
1977	13.34229
1978	3.16483
1979	24.70798
1980	36.94976
1981	7.59171
1982	12.15122
1983	6.34017
1984	6.01071
1985	1.2396
1986	-1.24695
1987	4.85228
1988	4.15569
1989	7.18089
1990	15.48974
1991	1.9981
1992	4.19654
1993	9.67785
1994	13.2692
1995	3.326
1996	1.84954
1997	-3.54357
1998	-1.85648
1999	4.30318
2000	12.04315
2001	2.79395
2002	-5.19253
2003	10.47815
2004	8.88469
2005	13.32137
2006	1.72921
2007	12.75187
2008	23.7941
2009	-27.63265
2010	12.73322
2011	15.7297
2012	-0.22529
2013	2.92965
2014	2.06296
2015	-12.06235
2016	1.63381
2017	3.03875