Year	Percent
1976	-0.02023
1977	-0.29849
1978	-1.00588
1979	-1.08864
1980	1.03381
1981	-0.38603
1982	-0.47973
1983	-0.51668
1984	0.51399
1985	-0.42853
1986	-0.167
1987	1.62459
1988	-0.31345
1989	1.29626
1990	3.0029
1991	3.27175
1992	4.03297
1993	1.44123
1994	2.39337
1995	2.25422
1996	2.49321
1997	2.42744
1998	4.21192
1999	5.91646
2000	4.66982
2001	6.28131
2002	4.57801
2003	7.2717
2004	5.51046
2005	5.69331
2006	7.07523
2007	6.33107
2008	10.06391
2009	4.03
2010	1.40828
2011	1.19639
2012	2.79276
2013	3.8161
2014	4.18881
2015	6.51995
2016	6.60157
2017	6.01321