1981

8.1

1957

8.5

1966

7.7

1973

1.0

1940

7.7

1989

7.2

1996

7.2

2002

8.4

1993

8.6

1996

6.8

1959

5.0

2015

7.2

1944

6.2

1976

6.0

1929

7.5

1942

6.6

1997

7.2

1975

8.0

2006

6.9

2006

7.5