Year	Percent
1970	1.17831
1971	-0.0897
1972	0.46612
1973	0.30778
1974	-3.71152
1975	5.06766
1976	3.17765
1977	1.75327
1978	3.14844
1979	3.14851
1980	1.64561
1981	0.86148
1982	2.41052
1983	1.94898
1984	1.792
1985	1.61176
1986	1.91595
1987	0.44616
1988	1.09474
1989	1.1988
1990	1.21748
1991	1.19244
1992	0.83753
1993	1.13665
1994	0.59187
1995	0.3354
1996	0.39665
1997	0.40726
1998	0.72416
1999	0.25525
2000	0.42035
2001	0.02674
2002	0.54229
2003	0.11541
2004	0.44845
2005	4.94938
2006	4.28876
2007	7.91754
2008	4.84668
2009	3.07063
2010	2.11903
2011	2.398
2012	1.77943
2013	2.04263
2014	1.58658
2015	-3.15279
2016	3.3899
2017	4.01703