1963

6.2

1968

6.9

1971

4.5

1970

6.0

1973

0.0

1964

7.0

1974

6.1

1986

2.3

1980

6.0

1973

7.0

1972

7.0

1981

6.3

1966

7.6

1978

0.0

1961

7.3

1979

7.3

1990

5.8

1977

0.0

1972

5.4

1984

7.2

1962

7.8

1972

5.7

1970

7.5

1978

6.3