1970

6.4

1988

7.1

1989

6.7

1983

6.9

1996

7.6

1987

6.6

1979

8.0

1999

6.8

1950

3.5

1972

5.4

1954

4.0

1992

3.7

1955

0.0

1949

6.0

1976

4.0

1983

0.0

2002

7.4

1961

5.9

1982

6.4

1961

3.0

1982

7.0

1953

6.0

1985

5.3