1979

6.8

1956

6.2

2006

5.1

2007

6.0

1991

5.1

2020

7.4

1977

6.7

1972

7.1

2000

6.3

1976

5.5

1970

6.0

2021

7.2

2006

6.3

1994

7.9

1983

7.0

2001

6.6

1997

6.0

1990

7.3

1968

6.9

1918

7.3