1957

7.2

1997

5.8

2021

6.6

1980

7.6

2005

7.1

1991

5.3

1988

7.7

1977

5.8

2017

7.2

2000

6.1

1937

6.9

1978

5.6

1956

6.7

2008

6.0

1941

7.0

1988

4.3

2021

5.8

2006

7.0

1998

7.5

1980

6.4