1930

6.1

1961

7.5

1983

7.1

1988

6.6

2007

4.6

1964

6.8

1932

5.0

2002

6.8

1946

7.0

1987

5.3

1982

6.6

1947

6.3

1982

5.9

1955

3.5

1938

5.3

1984

6.3

1960

8.2

1983

5.8

2002

4.8

1976

6.8