Year	Percent
1976	20.95854
1977	3.76582
1978	17.83854
1979	6.03288
1980	15.26425
1981	1.01598
1982	3.25171
1983	-2.12949
1984	4.227
1985	-0.67178
1986	2.91615
1987	-0.94061
1988	-5.61653
1989	-17.08101
1990	-3.72129
1991	-3.4078
1992	12.24251
1993	-0.89437
1994	0.05417
1995	2.0774
1996	-1.01808
1997	0.83022
1998	0.99495
1999	1.61576
2000	2.44289
2001	3.43724
2002	3.90374
2003	2.05176
2004	5.84466
2005	4.76795
2006	4.08378
2007	3.65251
2008	2.33113
2009	0.3537
2010	-2.83487
2011	-2.72953
2012	-2.71259
2013	-2.31533
2014	-1.53625
2015	-1.5209
2016	-1.19474
2017	-0.62118