Year	Percent
1966	1.51638
1967	-0.26647
1968	-0.27051
1969	1.22682
1970	0.57155
1971	25.04618
1972	1.4824
1973	15.10719
1974	162.80877
1975	-0.5974
1976	0.93185
1977	5.62003
1978	-1.95769
1979	40.805
1980	42.56671
1981	11.45341
1982	1.41685
1983	-11.31055
1984	0.34931
1985	4.85952
1986	-25.69954
1987	10.78617
1988	2.96596
1989	-1.72368
1993	-7.38642
1994	-5.87048
1995	4.8518
1996	15.51126
1997	-4.71944
1998	-17.14803
1999	18.07267
2000	20.52647
2001	-8.18019
2002	5.15304
2003	4.92456
2004	10.84995
2005	22.35761
2006	16.1734
2007	4.30679
2008	18.66198
2009	-17.21635
2010	11.16571
2011	17.22778
2012	7.4867
2013	0.22333
2014	-6.75791
2015	-25.95842
2016	-6.13364
2017	11.94655