1976

6.5

1946

7.6

1980

6.1

2001

6.1

2012

6.0

1982

5.4

2000

7.6

1986

5.8

1981

7.0

2004

6.4

1976

5.5

2009

7.3

1931

6.9

1960

7.7

1972

6.8

1995

5.5

2017

6.6

2001

6.2

1987

7.0

1984

6.3