1960

8.4

1987

7.1

1944

7.2

1991

7.3

1974

7.9

1988

7.5

1946

7.6

1941

7.7

1989

5.9

1996

7.4

1985

7.3

1980

5.3

2020

4.2

1957

7.0

1990

6.1

1982

6.7

2006

5.9

1983

3.6

1965

5.7

1993

3.6