1995

1.0

1961

8.0

1988

6.0

1975

5.6

1981

4.8

1967

7.5

1981

7.6

1983

5.1

1997

0.0

1984

6.9

1987

4.7

1991

0.0

1974

6.6

1975

5.0

1986

7.1

1973

6.2