Year	Percent
1961	-10.59829
1962	6.06376
1963	5.36605
1964	1.63607
1965	-1.25944
1966	11.01665
1967	-0.018
1968	4.40706
1969	4.32866
1970	-7.91573
1971	17.92915
1972	12.95778
1973	2.12158
1974	0.32062
1975	-2.77585
1976	-1.56878
1977	5.44889
1978	2.98062
1979	3.63118
1980	1.65791
1981	-0.11105
1982	-2.29582
1983	-2.4678
1984	-1.99703
1985	0.51367
1986	3.35193
1987	2.2217
1988	2.55103
1989	1.16762
1990	0.76617
1991	-1.82171
1992	-3.91632
1993	-2.72574
1994	-0.43815
1995	1.35964
1996	1.1821
1997	-2.32335
1998	0.46007
1999	-0.47151
2000	-2.11945
2001	0.98325
2002	-2.15504
2003	0.16744
2004	2.27531
2005	3.04703
2006	3.58809
2007	3.95022
2008	-2.48807
2009	0.51153
2010	5.48794
2011	3.26946
2012	1.78473
2013	3.09107
2014	2.61607
2015	3.00593
2016	3.19238
2017	2.27218