Year	Percent
1961	1.34892
1962	1.66744
1963	1.59066
1964	2.00049
1965	3.43234
1966	3.737
1967	-5.76452
1968	4.06738
1969	5.7232
1970	1.98182
1971	5.9855
1972	13.94212
1973	6.96502
1974	9.82034
1975	24.76217
1976	4.54295
1977	7.47889
1978	16.54644
1979	2.42839
1980	41.4595
1981	12.57712
1982	-4.85264
1983	11.55684
1984	8.10295
1985	18.70778
1986	16.25327
1987	11.73578
1988	20.0811
1989	14.83928
1990	11.9939
1991	17.82722
1992	13.93899
1993	11.29797
1994	7.76664
1995	12.81652
1996	6.00204
1997	9.01894
1998	9.92223
1999	8.13125
2000	6.30022
2001	11.47305
2002	14.20693
2003	2.43881
2004	9.60039
2005	5.92284
2006	9.31099
2007	0.38986
2008	12.86432
2009	0.15367
2010	4.15178
2011	8.41064
2012	2.47955
2013	8.89962
2014	12.82247
2015	9.91145
2016	2.94956
2017	-1.11214