1996

6.4

1990

3.0

1975

7.2

1992

6.2

1971

8.1

1994

7.8

1968

5.9

1980

6.1

1973

7.0

1974

4.9

1985

7.0

1982

7.3

1978

0.0

1984

7.4

1978

6.0

1986

6.0

1986

4.9

1984

7.2

1991

7.3

1977

6.9

1971

6.6

1981

6.3

1970

6.4

1978

6.7