Year	Percent
1970	1.94303
1971	0.17344
1972	1.28855
1973	0.36421
1974	2.10608
1975	2.56153
1976	-0.29648
1977	-0.03718
1978	0.306
1979	1.51538
1980	2.00552
1981	2.52732
1982	1.09401
1983	0.23973
1984	0.21071
1985	0.35334
1986	0.50513
1987	1.55935
1988	-0.21968
1989	-0.51739
1990	0.5588
1991	0.97319
1992	1.64957
1993	2.1588
1994	2.1768
1995	5.84791
1996	6.40938
1997	9.21814
1998	11.17146
1999	12.19663
2000	8.76825
2001	8.66858
2002	8.55789
2003	2.44235
2004	0.74577
2005	-2.49888
2006	2.45168
2007	2.79184
2008	3.0726
2009	2.43968
2010	3.16544
2011	3.58444
2012	3.91355
2013	5.70662
2014	1.98982
2015	1.68073
2016	0.98808
2017	1.93198