Year	Percent
1975	-10.77468
1976	3.02949
1977	2.70887
1978	6.91313
1979	15.59401
1980	10.51449
1981	8.23557
1982	2.07653
1983	2.02974
1984	5.00926
1985	4.80925
1986	5.05548
1987	5.77952
1988	1.50958
1989	1.36799
1990	2.5297
1991	-0.20827
1992	-0.03772
1993	-6.89768
1994	-0.33232
1995	1.48846
1996	1.46836
1997	1.99413
1998	1.98975
1999	0.66873
2000	0.9877
2001	0.55888
2002	7.50154
2003	5.56528
2004	4.36384
2005	4.23772
2006	4.80809
2007	4.52174
2008	4.75938
2009	2.03269
2010	1.70788
2011	8.74255
2012	3.696
2013	2.67138
2014	3.17021
2015	4.71165
2016	0.82516
2017	2.30127