Year	Percent
1981	1.04703
1982	-1.88438
1983	0.20848
1984	2.6392
1985	3.21695
1986	1.32995
1987	0.9494
1988	2.52135
1989	3.49064
1990	2.61547
1991	-2.14649
1992	-1.13972
1993	-1.03142
1994	0.46569
1995	-0.18835
1996	0.09699
1997	2.09392
1998	2.68433
1999	1.21087
2000	3.35438
2001	0.67337
2002	-0.59223
2003	-0.69989
2004	2.07214
2005	2.4568
2006	3.33809
2007	3.18558
2008	0.86492
2009	-3.43623
2010	1.93543
2011	0.56837
2012	-0.0608
2013	0.68757
2014	1.20683
2015	0.08062
2016	0.27485
2017	-0.01982