Year	Percent
1980	0.63098
1981	0.88371
1982	2.08649
1983	1.80366
1984	1.09501
1985	3.68038
1986	3.30879
1987	1.47207
1988	1.49386
1989	1.96057
1990	-2.98163
1991	6.26663
1992	3.46609
1993	5.23686
1994	3.83704
1995	8.52949
1996	2.39899
1997	5.38232
1998	17.12159
1999	40.16725
2000	9.62387
2001	24.00912
2002	13.95099
2003	25.20956
2004	11.18703
2005	-4.61801
2006	-0.09025
2007	-1.47785
2008	1.99455
2009	2.92122
2010	-3.91053
2011	-2.90424
2012	-6.05492
2013	-5.7
2014	1.51637
2015	9.04508
2016	-0.1883
2017	-5.9555