1975

6.4

1971

6.5

1992

4.6

1994

6.6

1981

5.5

1978

6.4

1974

6.2

1984

6.9

1965

7.9

1984

7.4

1974

1.0

1969

6.1

1966

7.6

1986

6.0

1980

0.0

1973

5.8

1980

0.0

1977

7.2

1980

7.3

1979

5.0