1
2
3
4
5
6
7
8
9
10
11
12
1950
-1.7
-1.5
-1.6
-1.0
-1.3
1951
-1.4
1952
1953
1954
-1.1
-0.9
1955
1956
-1.2
1957
1958
1959
1960
1961
1962
-2.0
-2.1
1963
1964
1965
1966
1967
-2.5
-2.6
-2.9
-3.3
1968
1969
1970
1971
-3.0
1972
1973
1974
1975
1976
1977
1978
1979
-0.8
-0.2
-0.1
1980
0.0
0.1
0.2
1981
1982
0.5
1983
0.4
1984
0.6
0.7
1.5
1.8
1985
2.4
1986
2.5
2.7
3.3
1987
1988
3.4
1989
2.0
1.9
1990
1991
2.3
1992
2.6
2.2
1993
1.6
1994
1.3
1.2
1.0
1995
1.1
1996
1.4
1997
1.7
2.1
1998
3.1
3.0
1999
3.2
2000
3.5
3.6
2001
3.7
3.8
2002
4.0
2003
4.1
4.2
4.3
2004
3.9
4.6
4.7
4.5
2005
4.8
2006
4.9
5.0
2007
5.1
2008
5.3
5.4
2009
5.6
2010
5.5
2011
5.7
2012
2013
2014