1967

5.8

1969

2.7

1959

7.5

1979

7.0

1975

7.4

1960

6.0

1967

6.8

1993

7.6

1968

6.1

1963

5.7

1976

7.5

1962

7.9

1969

4.0

1970

6.3

1980

7.3

1972

6.8