1984   13.05    0.89
  1985   12.34    0.83
  1986   12.07    0.78
  1987   11.90    0.68
  1988   11.00    0.49
  1989   10.51    0.56
  1990    9.05    0.48
  1991   14.28    0.55
  1992    2.27    0.39
  1993    3.91    0.42
  1994    7.26    0.47
  1995    3.69    0.53
  1996    2.39    0.37
  1997    6.63    0.72
  1998   11.96    0.67
  1999    2.21    0.52
  2000   -1.24    0.53
  2001   -0.65    0.54
  2002    3.13    0.62
  2003    4.75    0.68
  2004   -4.66    0.43
  2005    0.22    0.45
  2006    1.83    0.63
  2007    7.89    0.59
  2008    6.52    0.41
  2009    4.73    0.54
  2010    5.06    0.73
  2011    5.44    0.58
  2012    4.67    0.45
  2013    5.85    0.54
  2014   12.36    0.41