Year	Percent
1980	5.01919
1981	1.11582
1982	1.06642
1983	0.20862
1984	1.88501
1985	-0.40711
1986	-3.43629
1987	-1.83705
1988	-0.33042
1989	-1.73778
1990	-3.60868
1991	4.27413
1992	-5.82669
1993	-7.62797
1994	-0.625
1995	2.0149
1996	13.58777
1997	12.82507
1998	7.02428
1999	-4.62022
2000	-5.34545
2001	-9.39016
2002	-8.03693
2003	-10.25873
2004	-11.2365
2005	-14.77013
2006	-17.21674
2007	-18.83153
2008	-19.75812
2009	-8.27708
2010	-2.84948
2011	0.37616
2012	-3.1727
2013	-0.40978
2014	-0.9431
2015	0.14774
2016	4.31351
2017	1.52994