Year	Percent
1961	5.61261
1962	2.4881
1963	-6.54831
1964	1.05321
1965	0.88355
1966	-1.39482
1967	-0.68297
1968	4.6375
1969	4.4944
1970	3.26742
1971	4.54866
1972	5.33211
1973	4.9374
1974	4.62362
1975	4.52351
1976	-2.03504
1977	-11.57617
1978	3.3226
1979	6.6776
1980	14.26044
1981	14.22145
1982	20.01753
1983	2.79978
1984	3.92601
1985	-3.95527
1986	-9.42729
1987	-2.53235
1988	-0.97243
1989	-0.15022
1990	-1.70865
1991	-0.35319
1992	-0.14595
1993	-3.65182
1994	-8.06151
1995	1.13396
1996	1.39394
1997	-3.41734
1998	0.81159
1999	-5.31218
2000	4.59511
2001	0.98264
2002	1.77719
2003	-1.93089
2004	0.52281
2005	4.48667
2006	2.8042
2007	-4.89597
2008	2.00165
2009	3.97541
2010	5.45484
2011	0.53221
2012	1.09746
2013	0.87112
2014	4.15578
2015	0.0874
2016	-5.26846
2017	-7.03621