2000

5.2

2003

5.3

1983

6.9

1934

7.5

1988

5.5

1973

6.2

1997

8.3

1955

7.3

1995

7.8

1969

6.7

2010

7.3

2008

4.7

2005

4.2

2007

6.2

2014

7.3

1929

6.6

1977

5.9

1988

6.0

1928

6.8

2000

6.0