1974

6.1

1968

8.0

1978

7.0

1966

5.7

1962

5.7

1982

4.5

1986

1.0

1952

6.5

1959

7.7

1969

5.0

1970

6.8

1957

5.2

1961

6.8

1970

3.2

1962

6.4

1984

6.5

1985

5.7