1
2
3
4
5
6
7
8
9
10
11
12
1950
-6.9
-7.0
1951
1952
-7.1
1953
1954
-7.2
-6.7
-6.6
1955
-6.5
-6.4
1956
-6.1
-5.8
-5.7
-5.6
1957
-5.5
1958
-5.4
-5.3
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
-5.2
-1.7
1973
-1.6
1974
-1.1
1975
1976
1977
-1.2
1978
-0.9
-0.8
0.7
1.3
1979
1.5
1.6
2.0
1980
2.1
2.2
2.4
2.7
2.8
2.9
3.0
1981
1982
3.1
3.4
3.2
1983
3.3
3.7
1984
3.9
4.0
4.1
4.2
1985
4.3
4.4
1986
1987
3.8
1988
1989
1990
3.6
1991
3.5
1992
4.6
1993
4.7
1994
4.9
5.0
1995
4.5
1996
1997
1998
1999
2000
2001
2002
2003
2.6
2.5
2.3
2004
1.8
1.4
1.2
1.1
1.0
0.8
0.3
2005
0.1
-0.4
-1.3
-1.8
-1.9
-2.0
-2.2
-2.3
-2.4
2006
-2.6
-2.7
-2.5
2007
-1.5
-1.4
-0.7
-0.6
-0.5
-0.2
0.2
2008
0.9
1.7
1.9
2009
2010
2011
2012
-2.8
-3.1
-3.3
2013
-3.4
-3.5
-3.6
-3.7
-3.8
-4.0
-4.1
-4.5
2014
-4.6
-4.7
-4.9
-5.0
-4.8