7.8

2020

6.0

1968

6.9

5.7

6.4

2002

6.5

1980

7.0

1999

7.2

1993

6.9

1970

7.7

1955

7.2

1968

7.4

2013

6.8

1981

6.6

1933

7.6

1975

7.2

1990

6.5

2012

6.3

1989

5.4

1985

6.2