Year	Percent
1961	-5.75103
1962	2.93351
1963	2.0405
1964	3.98192
1965	-0.07118
1966	-0.99646
1967	0.02839
1968	1.22443
1969	3.35529
1970	-1.31807
1971	0.76587
1972	3.48998
1973	7.5528
1974	20.12852
1975	22.86596
1976	-1.89827
1977	11.03022
1978	1.67504
1979	9.91159
1980	9.47952
1981	1.20343
1982	4.60261
1983	-2.85185
1984	5.26715
1985	1.18542
1986	0.47289
1987	16.84706
1988	8.95795
1989	3.27009
1990	-0.16733
1991	5.54465
1992	-1.06322
1993	7.0761
1994	5.34436
1995	6.51069
1996	5.46555
1997	-10.00882
1998	-6.6667
1999	0.91775
2000	-6.89174
2001	-4.31703
2002	0.44321
2003	9.67241
2004	11.19655
2005	10.04984
2006	1.64774
2007	11.69924
2008	7.34935
2009	29.05327
2010	5.47371
2011	10.48845
2012	3.98777
2013	3.17744
2014	2.69634
2015	1.04322
2016	4.97358
2017	0.25221