1952

7.7

1931

7.2

1988

6.2

1960

7.6

1987

6.5

1988

6.5

1931

7.5

1990

6.3

1972

8.7

1960

7.4

1972

7.2

1927

6.1

1954

6.8

1977

8.2

2013

5.8

1993

7.3

1984

6.9

2008

5.8

1996

5.3

2011

7.0