1997

6.6

1994

7.2

1968

6.7

1969

5.0

1970

2.0

1984

7.4

1987

5.2

1975

6.7

1967

7.7

1978

0.0

1977

2.9

1961

5.4

1972

6.9

1984

4.5

1962

7.4

1983

3.0