1979  0.6416521
1980  -1.576619
1981  0.7216616
1982  0.3999585
1983  -0.7274456
1984  1.230646
1985  0.6767191
1986  -1.06048
1987  -0.9102316
1988  0.02330347
1989  0.2701511
1990  0.31364
1991  -0.7597387
1992  -0.7308571
1993  -1.59286
1994  2.766563
1995  -0.2550358
1996  -0.2454783
1997  1.108784
1998  -1.947308
1999  1.05475
2000  0.8228621
2001  0.2759095
2002  -0.6432233
2003  -0.7204167
2004  1.447327
2005  0.2110698
2006  0.4635891
2007  0.7401451
2008  -0.09128216
2009  -1.513299
2010  0.5202044
2011  -0.02119985
2012  0.8714402
2013  0.4785312
2014  -1.052481
2015  -1.392574
2016  0.2016232