1959

5.9

1976

6.9

1953

6.5

1962

7.0

1966

6.3

1974

2.7

1963

6.8

1964

6.6

1975

5.5

1964

6.3

1956

5.5

1957

5.7

1950

6.8

1955

7.2

2004

6.8

2003

6.3

1965

6.2

1988

6.8

1963

4.0

1999

6.4