1
2
3
4
5
6
7
8
9
10
11
12
1950
4.5
4.6
5.3
5.2
1951
4.9
1952
4.8
1953
1954
5.5
1955
1956
5.6
1957
1958
5.4
1959
1.5
1.4
0.2
0.1
-0.1
0.0
1960
0.4
1961
-0.5
1962
-0.7
-0.9
-1.3
-2.3
-4.1
-4.8
-4.9
1963
-5.2
-5.3
-5.4
1964
1965
-5.9
-6.0
-6.2
1966
1967
-6.3
1968
1969
1970
-6.1
1971
-6.4
1972
1973
1974
1975
1976
-4.5
1977
1978
1979
-4.2
1980
1981
-3.9
-3.8
1982
1983
1984
-3.7
-3.6
1985
-3.5
1986
1987
1988
-2.8
1989
-2.7
-2.5
1990
-2.4
-2.2
1991
-2.1
-1.9
-1.2
1992
-1.0
-0.6
1993
-0.4
0.3
1994
0.6
0.7
0.8
1995
1996
1.6
1997
1.7
1998
1.3
1999
2000
1.9
2.0
2001
2.1
2.2
2002
2.5
2.6
2003
2.7
2.8
3.4
3.3
3.5
2004
3.6
3.7
2005
3.8
2006
2007
5.0
2008
5.1
2009
2010
2011
2012
2013
2014