1995

5.2

1949

7.5

2012

6.0

1967

6.7

1955

7.2

1959

7.0

1953

7.3

1980

6.8

1988

6.3

2011

7.6

1956

7.1

1965

6.3

1941

7.1

2007

6.6

2013

7.5

1968

6.5

2002

4.6

2002

6.7

1977

5.7

1980

7.0