1947

7.2

1986

6.0

1980

6.4

1971

4.3

1984

6.1

1960

5.5

1962

6.6

2003

6.3

2002

6.8

1975

6.7

1982

5.3

1978

6.3

1937

6.7

2017

6.8

2014

6.9

2008

6.6

1950

6.8

2001

6.3

2003

5.6

2007

7.2