Year	Percent
1975	-2.49609
1976	3.8051
1977	3.04199
1978	4.37641
1979	7.40813
1980	3.979
1981	-2.24344
1982	-5.1851
1983	0.23268
1984	3.32597
1985	0.81123
1986	4.76759
1987	2.25151
1988	3.13328
1989	3.22826
1990	-3.64019
1991	-4.2314
1992	-7.32243
1993	0.85188
1994	3.43593
1995	1.63659
1996	3.61559
1997	4.30661
1998	3.31105
1999	0.03711
2000	1.94933
2001	-2.70215
2002	0.50556
2003	1.9072
2004	1.0907
2005	3.65157
2006	5.30416
2007	1.39044
2008	-0.32196
2009	-4.3968
2010	-0.09428
2011	0.32964
2012	-0.0505
2013	-0.32707
2014	-0.30912
2015	0.60463
2016	1.7212
2017	1.41379