1979      3.05
1980      3.25
1981      0.78
1982      3.78
1983      1.98
1984      0.98
1985      2.25
1986      0.98
1987      2.18
1988      1.38
1989     -3.75
1990     -2.15
1991     -0.48
1992     -2.01
1993      1.18
1994     -0.35
1995     -2.75
1996     -5.21
1997     -2.75
1998     -0.75
1999      0.85
2000     -2.48
2001     -0.95
2002     -4.21
2003     -2.88
2004     -5.95
2005     -6.21
2006     -6.88
2007     -7.55
2008     -3.88
2009     -2.88
2010     -2.01
2011     -5.68
2012     -1.81