1972

6.4

1951

7.5

1977

7.3

1998

6.9

1957

8.3

1937

7.9

1997

7.6

1999

5.6

1991

6.3

2002

6.7

1998

6.3

1991

7.5

1976

5.3

1990

6.9

1987

7.5

1995

7.3

1997

6.8

2006

6.4

1959

7.3

2018

7.0