Year	Percent
1970	1.8113
1971	1.27894
1972	0.5357
1973	0.09344
1974	1.89131
1975	0.49315
1976	0.05027
1977	-0.29988
1978	-0.23375
1979	-0.84054
1980	-0.01241
1981	0.07252
1982	0.39868
1983	0.07985
1984	0.47735
1985	-0.65403
1986	-0.06149
1987	-0.17844
1988	0.13389
1989	-0.15609
1990	-0.06553
1991	0.20504
1992	0.0025
1993	0.00841
1994	0.26791
1995	0.80305
1996	0.55308
1997	2.49731
1998	0.39945
1999	1.10028
2000	0.71049
2001	5.97886
2002	1.27847
2003	0.44685
2004	0.30638
2005	2.53117
2006	0.22931
2007	2.20269
2008	3.44305
2009	2.5653
2010	0.98409
2011	0.99293
2012	1.16721
2013	2.24424
2014	1.65049
2015	0.47874
2016	0.74902
2017	0.39263