1957

8.1

1993

4.9

1951

7.8

1966

7.2

1962

8.0

1967

7.5

2014

7.5

1987

6.2

1994

4.9

1965

7.5

2008

6.8

1931

7.2

2011

9.8

2000

6.9

1982

6.9

1976

6.4

2005

6.8

1985

6.4

1932

7.3

1971

7.8