Year	Percent
1971	-0.60368
1972	2.78891
1973	2.67241
1974	1.01049
1975	-3.33803
1976	-0.18118
1977	-0.28069
1978	-1.44222
1979	-3.06445
1980	-1.33076
1981	-3.94875
1982	-2.93137
1983	-2.59534
1984	-2.59835
1985	-2.02379
1986	-1.00182
1987	1.32567
1988	0.97049
1989	0.80168
1990	-0.14261
1991	-1.36613
1992	-2.87054
1993	-4.41262
1994	-0.40357
1995	0.86972
1996	3.82048
1997	9.12362
1998	3.49243
1999	3.73036
2000	1.91345
2001	1.51784
2002	2.35499
2003	7.36666
2004	3.32467
2005	3.82512
2006	1.79487
2007	-2.00718
2008	-9.87404
2009	-4.37595
2010	-5.34426
2011	-3.85185
2012	-0.03974
2013	2.39251
2014	4.29811
2015	2.40498
2016	2.85553
2017	2.29146