1962

7.3

1953

7.9

1968

7.8

1972

6.4

1999

5.7

1996

7.6

1991

7.6

1961

8.0

1958

7.5

1999

7.4

2001

7.6

1998

6.6

1957

7.8

1951

7.4

1974

7.9

1931

8.1

1952

7.9