1974

7.8

1955

7.3

1956

7.1

1957

7.1

1975

7.3

1997

6.7

1995

8.0

2003

7.5

1999

7.5

2006

6.4

2004

6.5

2000

8.1

1945

7.7

2005

6.7

1968

7.8

2005

6.7

1962

7.6

1969

6.6

2019

7.4

1969

7.0