1956

6.6

1985

6.5

1963

7.9

1970

6.5

1978

8.0

1984

6.4

1982

6.5

1990

5.8

1971

6.0

1980

5.0

1986

7.3

1977

7.6

1989

6.3

1991

6.4

1988

5.0

1985

6.4

1988

0.0

1970

7.6

1964

6.2