Year	Percent
1972	0.04469
1973	0.03662
1974	-0.0564
1978	-0.04026
1981	0.02403
1982	0.02081
1983	-0.01764
1984	-0.01559
1985	-0.07124
1986	0.01397
1987	0.01245
1988	0.01155
1989	0.04171
1990	0.00244
1991	0.02482
1992	0.02918
1993	0.01232
1994	0.03794
1995	0.03519
1996	0.00524
1997	0.04794
1998	0.00826
1999	0.0109
2000	0.12571
2001	0.0252
2002	0.02735
2003	0.01979
2004	0.01287
2005	0.03821
2006	0.09616
2007	0.05215
2008	0.09408
2009	0.17724
2010	0.16811
2011	0.04652
2012	0.02985
2013	0.04658
2014	0.0458
2015	0.07206
2016	0.57442
2017	0.14271