-2.46
-8
-6
-4
-2
2
-2.64
1980
-2.52
1981
-3.86
1982
-5.87
1983
-4.69
1984
-4.97
1985
-4.88
1986
-3.13
1987
-3.01
1988
-2.74
1989
-3.74
1990
-4.41
1991
-4.51
1992
-3.75
1993
-2.82
1994
-2.16
1995
-1.35
1996
-0.26
1997
0.77
1998
1.32
1999
2.33
2000
1.21
2001
-1.45
2002
-3.33
2003
-3.41
2004
-2.47
2005
-1.81
2006
-1.12
2007
-3.11
2008
-9.80
2009
-8.75
2010
-8.45
2011
-6.78
2012
-4.12
2013
-2.82
2014
-2.46
2015
