Year	Percent
1974	0.64755
1975	1.66581
1976	1.82443
1977	1.20971
1978	2.55879
1979	1.83564
1980	1.31557
1981	0.9831
1982	1.12561
1983	0.81598
1984	0.60287
1985	0.76853
1986	-0.14051
1987	0.26277
1988	0.24204
1989	0.2166
1990	1.27102
1991	2.72186
1992	2.57514
1993	2.13635
1994	1.46648
1995	2.08968
1996	3.45009
1997	3.31159
1998	12.24958
1999	18.56564
2000	25.53842
2001	8.77137
2002	23.03908
2003	13.64141
2004	-5.67092
2005	22.21984
2006	9.51414
2007	22.20717
2008	8.45704
2009	22.82382
2010	17.01438
2011	9.90087
2012	18.15902
2013	20.86982
2014	33.61718
2015	80.98493
2016	25.97061
2017	-1.02957