Year	Percent
1961	1.96934
1962	2.00494
1963	2.04342
1964	2.04046
1965	1.9147
1966	1.67794
1967	1.79902
1968	4.25059
1969	2.28617
1970	2.30206
1971	1.78433
1972	8.17517
1973	3.60491
1974	11.81906
1975	2.07461
1976	-1.4298
1977	5.06461
1978	6.38624
1979	5.73655
1980	12.88963
1981	-1.0507
1982	-2.8725
1983	-4.82128
1984	-0.91931
1985	-1.73619
1986	1.70841
1987	8.18401
1988	6.36491
1989	10.3534
1990	8.2202
1991	8.43078
1992	10.19595
1993	4.50238
1994	-1.8574
1995	-1.92801
1996	-1.75784
1997	-0.16011
1998	-0.16841
1999	4.8019
2000	9.25016
2001	1.85717
2002	2.22325
2003	6.51386
2004	2.01269
2005	-0.02414
2006	1.89558
2007	-1.491
2008	0.61276
2009	-1.77769
2010	0.85738
2011	-0.24834
2012	1.48635
2013	-1.47548
2014	1.82265
2015	1.60116
2016	-2.56546
2017	-1.19691