1984

6.1

1981

4.3

1990

5.7

1979

6.7

1990

4.8

1982

6.6

1987

6.9

1983

2.3

1949

3.7

1979

5.4

1959

7.8

1960

5.8

1976

5.6

1955

5.8

1983

5.0

1967

6.5

1967

5.1