Year	Percent
1961	-2.58426
1962	4.08276
1963	-5.46212
1964	-3.82261
1965	3.81674
1966	-6.28718
1967	-1.46828
1968	-0.98061
1969	-1.56932
1970	2.8032
1971	-0.79022
1972	-7.91573
1973	-2.42355
1974	7.99803
1975	12.05969
1976	12.92034
1977	2.77432
1978	-9.01839
1979	-8.16634
1980	-1.8627
1981	3.82498
1982	2.39104
1983	-1.31604
1984	-8.03172
1985	-9.10556
1986	2.42124
1987	11.14265
1988	-2.91881
1989	6.14675
1990	-7.88824
1991	4.75056
1992	3.8363
1993	1.86166
1994	-1.63573
1995	3.19005
1996	3.0781
1997	7.56694
1998	1.45249
1999	0.26378
2000	3.40686
2001	3.54729
2002	3.47184
2003	4.75742
2004	1.04806
2005	4.60615
2006	7.16839
2007	8.63728
2008	5.04604
2009	0.61404
2010	0.83479
2011	7.88947
2012	12.81521
2013	1.95913
2014	0.26331
2015	2.43623
2016	2.23711
2017	1.82735