1962

6.8

1981

5.2

1979

7.0

1954

4.7

1958

7.6

1978

6.3

1977

5.9

1970

7.3

1985

5.3

1976

7.2

1984

6.6

1980

6.3

1984

5.6

1981

2.0

1972

6.1

1984

5.0

1972

6.1

1984

4.7

1969

2.5

1958

6.6

1977

4.0

1983

6.1

1966

7.1

1965

8.0