1994

6.4

1995

5.6

1998

6.3

1993

5.7

1997

5.6

1999

6.5

1988

7.0

2006

6.3

1952

7.4

1929

7.0

2001

5.8

1968

7.6

1944

4.3

1930

4.1

1959

7.2

1953

6.4

1949

6.3

1961

4.3

1977

5.2

1945

4.0