2011

5.5

1981

6.7

1989

5.1

1996

8.0

1929

5.2

1973

5.6

1992

8.9

1999

6.8

1980

6.6

2017

6.5

1974

6.3

2011

6.6

1949

6.2

1991

6.2

1920

7.3

1977

7.1

1999

5.1

1965

6.8

1983

5.7

1990

6.0