10.0

2000

7.2

1987

7.5

1969

7.9

1953

6.8

1990

7.4

1976

7.5

2004

5.8

2006

7.0

1944

7.6

1969

7.3

2007

7.1

1977

7.1

1936

6.3

2013

6.1

2001

6.4

1931

6.9

2009

7.9

2012

6.0

1965

7.7