Year	Percent
1970	0.07119
1971	-0.06494
1972	0
1973	-0.10494
1974	0.29472
1990	0.80571
1991	0.93338
1992	1.35943
1993	1.13411
1994	0.03691
1995	0.31657
1996	0.61482
1997	0.10746
1998	0.3994
1999	0.51855
2000	0.28491
2001	0.56221
2002	0.37755
2003	0.84154
2004	0.17458
2005	0.50364
2006	0.3828
2007	0.47104
2008	0.11607
2009	0.04485
2010	0.12375
2011	0.20139
2012	0.60733
2013	0.52378
2014	0.42798
2015	0.24116
2016	1.92138
2017	0.21137