Year	Percent
1971	2.24668
1972	3.27656
1973	5.71074
1974	3.80606
1975	-3.62495
1976	0.03974
1977	-4.23498
1978	0.28593
1979	2.59282
1980	1.15739
1981	4.25278
1982	-0.06764
1983	2.09473
1984	3.89027
1985	0.98878
1986	2.73111
1987	-5.13228
1988	1.72443
1989	0.0445
1990	-0.2753
1991	-6.29434
1992	0.21704
1993	5.32501
1994	3.82707
1995	3.05698
1996	1.73502
1997	1.66539
1998	0.17334
1999	4.64241
2000	1.69019
2001	3.18778
2002	3.25127
2003	2.49733
2004	1.74617
2005	2.15923
2006	1.33015
2007	2.79744
2008	-2.37758
2009	0.90226
2010	-0.15405
2011	1.91574
2012	1.93903
2013	1.23716
2014	1.99286
2015	2.48
2016	1.32186
2017	0.86445