1975

6.4

2002

6.1

1935

6.5

2008

5.1

1936

7.3

1949

6.3

1991

5.7

1992

6.3

2001

5.2

2007

5.4

1992

6.6

2005

6.4

2008

6.0

1993

6.3

1947

6.9

1953

5.4

2014

6.8

1948

6.7

1999

4.6

1988

6.9