1993

6.5

1987

6.8

1980

5.5

2009

6.9

1986

5.6

1951

7.2

2001

6.6

1931

6.8

2008

8.0

1929

5.7

1934

5.2

1934

6.3

1933

6.8

1998

6.6

1937

5.9

1936

6.7

1954

5.5

1939

6.5

1953

6.0

1952

4.9