1983

7.8

1989

5.9

1978

6.8

1990

4.7

1975

5.0

1973

5.6

1979

5.0

1977

4.5

1982

7.5

1990

7.4

1965

7.0

1964

4.0

1988

5.6

1980

1.0

1963

5.8

1963

7.2

1993

4.7