Year	Percent
1972	0.00293
1973	-0.00103
1974	0.02053
1976	-0.00275
1978	0.02556
1979	0.01621
1980	0.01542
1981	-0.01011
1982	-0.00125
1983	-0.02452
1984	0.0368
1985	0.02481
1986	0.04104
1987	0.047
1988	0.0195
1989	0.01191
1990	0.16375
1991	0.05661
1996	0.42375
1997	0.46875
1998	0.24761
1999	0.08642
2000	-0.00882
2001	0.34709
2002	-0.09837
2003	0.23344
2004	-0.00574
2005	0.03016
2006	-0.07351
2007	0.05561
2008	0.00793
2009	0.29772
2010	0.54829
2011	0.49711
2012	0.48801
2013	0.38526
2014	0.15199
2015	0.24238
2016	0.50159
2017	0.802