2009

7.1

1993

4.9

2006

5.6

1997

6.0

1953

6.1

2001

6.5

1980

6.8

1945

6.7

1928

7.3

1962

7.3

2007

7.2

2017

6.4

2015

6.6

2003

7.4

1988

5.0

1991

6.5

2005

6.8

2017

6.1

1970

7.1

1999

6.2