1943

6.9

1960

6.2

1968

7.4

1988

6.3

2008

3.4

1992

7.5

1929

7.5

2002

7.1

1948

7.9

1961

7.2

2005

6.8

1975

10.0

1927

5.9

1990

7.0

1993

6.9

1994

7.1

1992

6.6

1972

7.4

1990

6.6

1976

8.3