Year	Percent
1961	0.61812
1962	4.48067
1963	2.90827
1964	4.34055
1965	5.0781
1966	5.27711
1967	1.38995
1968	3.75882
1969	2.09737
1970	2.01142
1971	1.9977
1972	4.14241
1973	4.63958
1974	-1.42195
1975	-1.17688
1976	4.38943
1977	3.56175
1978	4.44909
1979	2.04333
1980	-1.19726
1981	1.59252
1982	-2.84155
1983	3.68008
1984	6.33443
1985	3.31913
1986	2.5594
1987	2.5411
1988	3.26208
1989	2.70597
1990	0.77452
1991	-1.40047
1992	2.12911
1993	1.39986
1994	2.76962
1995	1.50307
1996	2.59531
1997	3.23659
1998	3.23939
1999	3.48993
2000	2.94029
2001	-0.01849
2002	0.84613
2003	1.92696
2004	2.82965
2005	2.39705
2006	1.68142
2007	0.81519
2008	-1.23028
2009	-3.62412
2010	1.68111
2011	0.8497
2012	1.45929
2013	0.95672
2014	1.80046
2015	2.08708
2016	0.74279
2017	1.547