Year	Percent
1970	2.96009
1971	2.62735
1972	2.4873
1973	1.73313
1974	4.13765
1975	3.60555
1976	1.44708
1977	0.68679
1978	0.96161
1979	-0.11568
1980	0.7661
1981	0.09024
1982	0.50843
1983	0.20877
1984	2.25909
1985	0.04627
1986	-0.24754
1987	0.00765
1988	1.26384
1989	0.5842
1990	1.23885
1991	-1.30245
1992	-0.39455
1993	0.38635
1994	2.11479
1995	0.40381
1996	0.69257
1997	0.5583
1998	0.69144
1999	3.29565
2000	1.49125
2001	1.12438
2002	0.16878
2003	2.05326
2004	3.10151
2005	3.82112
2006	0.88952
2007	2.80649
2008	3.67275
2009	0.79359
2010	1.39388
2011	10.15523
2012	-0.1474
2013	8.17845
2014	9.87799
2015	8.09786
2016	5.99356
2017	4.39632