1968

6.7

1977

6.5

2019

6.9

2004

5.9

1963

6.8

1981

6.3

2004

6.1

1991

7.1

1952

6.7

1980

5.7

1977

6.6

1966

8.0

1947

7.7

1994

6.4

1970

7.0

1939

7.5

1944

7.3

2019

7.1

1983

7.1

1956

7.6