1969

4.9

1972

6.3

1983

7.2

1968

7.1

1986

6.9

1973

5.9

1973

6.0

1977

4.3

1972

6.6

1969

6.6

1976

0.0

1969

6.7

1975

3.0

1980

2.0

1984

3.8

1974

0.0