1975

7.9

1946

7.6

2001

6.1

1998

6.2

1975

6.8

1976

6.5

2020

5.8

2004

4.7

2004

7.1

2008

4.5

1969

6.6

2010

7.1

1980

6.1

1969

7.5

1957

6.8

1989

6.2

1931

6.9

1903

7.0

1984

6.3

1972

5.9