Year	Percent
1981	-7.65344
1982	-3.52373
1983	0.5341
1984	2.43385
1985	0.26379
1986	-0.03967
1987	1.32505
1988	3.4033
1989	-2.60819
1990	-6.1805
1991	-2.08184
1992	-8.85082
1993	-26.45264
1994	-1.86429
1995	11.55304
1996	10.34822
1997	4.38289
1998	1.88663
1999	-0.67225
2000	-0.02404
2001	0.87829
2002	9.85336
2003	0.9314
2004	6.36805
2005	16.6599
2006	14.82047
2007	18.8758
2008	9.8327
2009	-1.1756
2010	-0.17534
2011	0.23011
2012	1.49965
2013	3.13508
2014	1.11747
2015	-0.47127
2016	-4.09806
2017	-2.56103