1979      0.19
1980      0.13
1981      0.85
1982      0.19
1983     -2.52
1984      0.35
1985     -0.25
1986     -1.91
1987     -0.59
1988      0.19
1989     -1.86
1990     -0.64
1991      0.58
1992      0.58
1993     -1.58
1994      0.91
1995      0.69
1996      0.35
1997     -0.31
1998      0.63
1999      1.07
2000      2.95
2001     -0.20
2002     -3.57
2003     -0.14
2004      0.80
2005      1.02
2006      1.57
2007     -0.20
2008     -0.81
2009      3.01
2010      4.28
2011      0.08
2012      1.57