1970

6.3

1978

4.7

1990

5.0

1946

5.6

1978

2.0

1951

7.9

1989

1.0

1950

6.2

1974

7.0

1947

7.2

1980

5.0

1972

5.5

1977

5.6

1979

6.8

1969

6.0