1
2
3
4
5
6
7
8
9
10
11
12
1950
-7.5
-7.6
-7.8
-7.9
-8.0
-8.1
-8.2
1951
-8.3
1952
-7.7
1953
-7.4
-7.3
-7.2
-6.1
-5.9
1954
-6.0
-5.8
-6.4
1955
-6.9
-7.0
-6.7
-6.3
-6.2
1956
1957
-5.7
1958
1959
1960
-6.5
1961
-6.6
-6.8
1962
1963
1964
-7.1
1965
1966
1967
1968
1969
1970
1971
1972
-4.7
-4.9
1973
-4.6
-4.3
-4.0
-3.9
1974
-3.7
-3.3
1975
-3.2
-2.8
1976
-2.7
1977
-2.6
1978
-2.5
-2.1
1979
0.0
0.6
0.7
1.3
1.4
1.5
1980
1.6
1.8
1.9
2.0
2.2
2.1
1981
2.3
1982
2.4
2.5
1983
1984
2.6
1985
2.7
1986
2.9
2.8
1987
3.0
1988
1989
0.3
-0.1
-0.4
-0.7
-0.6
1990
-0.8
-0.9
1991
1992
-0.5
-1.1
-1.0
1993
-1.2
1994
-0.3
-0.2
1995
0.4
0.1
1996
1997
0.2
0.5
1998
3.1
3.2
3.3
1999
2000
2001
2002
2003
0.8
2004
1.2
2005
2006
1.1
1.0
1.7
2007
2008
0.9
2009
2010
2011
2012
2013
2014
..........