Year	Percent
1961	12.25285
1962	-2.1487
1963	-4.79457
1964	24.01669
1965	12.78889
1966	-2.66401
1967	0.57474
1968	7.01365
1969	-1.67381
1970	8.75767
1971	-1.0882
1972	-3.58449
1973	-7.31913
1974	8.95481
1975	-7.84008
1976	5.46036
1977	-4.6584
1978	-3.3196
1979	1.82413
1980	0.44126
1981	0.51157
1982	-5.11542
1983	0.79713
1984	-5.94401
1985	0.13583
1986	2.80859
1987	-0.87857
1988	-1.0315
1989	1.96581
1990	-4.38943
1991	-0.89974
1992	-0.8015
1993	3.06551
1994	-5.70185
1995	6.72059
1996	2.72139
1997	-6.93132
1998	-0.35183
1999	4.45211
2000	-3.39086
2001	-0.9655
2002	-2.22539
2003	2.97181
2004	2.76888
2005	5.91003
2006	15.54982
2007	-0.03801
2008	-1.7344
2009	-3.82902
2010	1.77653
2011	1.65873
2012	2.68586
2013	2.97353
2014	2.52043
2015	-1.4711
2016	-0.81446
2017	0.70969