Year	Percent
1976	-3.22787
1977	10.18913
1978	7.49024
1979	-6.20002
1980	-5.37237
1981	0.10367
1982	-2.20751
1983	-3.37897
1984	-4.52116
1985	-2.86454
1986	-4.92675
1987	-15.68193
1988	6.62218
1989	8.76725
1990	-2.43748
1991	0.86517
1992	-1.98299
1993	-8.82382
1994	1.59394
1995	-0.42705
1996	-0.14605
1997	4.3641
1998	0.33063
1999	-2.02642
2000	-1.20828
2001	3.38223
2002	3.15469
2003	4.8622
2004	8.08342
2005	3.45657
2006	2.73825
2007	3.99831
2008	3.04304
2009	1.93116
2010	4.07256
2011	4.757
2012	1.64103
2013	1.89697
2014	-0.73035
2015	-3.52717
2016	-6.019
2017	-0.79887