Year	Percent
1961	2.93058
1962	1.74451
1963	3.5266
1964	0.32597
1965	-1.23154
1966	8.8481
1967	1.41422
1968	1.43313
1969	1.83865
1970	-0.1474
1971	7.38671
1972	-2.78925
1973	-6.6635
1974	0.67934
1975	-14.3181
1976	2.20385
1977	8.75635
1978	6.08162
1979	6.79563
1980	6.36333
1981	4.9151
1982	-12.36789
1983	-6.48028
1984	2.4697
1985	2.34171
1986	3.64966
1987	4.68499
1988	5.54432
1989	8.09407
1990	1.64542
1991	6.08116
1992	9.42827
1993	4.96389
1994	3.4745
1995	7.36959
1996	5.32062
1997	5.98764
1998	2.9727
1999	-1.66179
2000	4.04473
2001	2.08431
2002	1.92788
2003	2.93213
2004	6.04014
2005	4.60803
2006	5.19192
2007	3.81188
2008	2.47165
2009	-2.54395
2010	4.82324
2011	5.12114
2012	4.3671
2013	3.13202
2014	0.89537
2015	1.44776
2016	0.43428
2017	0.67498