Year	Percent
1970	2.20426
1971	1.36359
1972	1.29012
1973	1.59426
1974	1.78835
1975	1.06324
1976	2.0396
1977	0.99752
1978	1.47059
1979	1.7032
1980	0.76994
1981	1.13624
1982	1.34572
1983	0.71449
1984	5.76532
1985	5.07205
1986	3.96578
1987	3.18337
1988	3.77507
1989	3.68364
1990	3.81178
1991	3.01665
1992	4.64533
1993	5.12918
1994	4.52572
1995	5.18859
1996	3.33279
1997	3.73303
1998	2.28184
1999	1.94974
2000	-2.86532
2001	0.48136
2002	4.27533
2003	-3.81179
2004	2.23264
2005	1.66204
2006	2.60969
2007	3.15732
2008	1.94476
2009	-0.04317
2010	0.19532
2011	0.81823
2012	2.18334
2013	-0.03644
2014	1.61681
2015	-0.00552
2016	1.02221
2017	1.57229