1982

5.9

1997

5.2

1995

4.8

1971

5.4

1974

0.0

2000

6.8

1981

6.4

1992

3.7

1991

3.6

1978

4.9

1985

5.9

1976

7.2

1982

5.6

1993

6.3

1990

4.0

1988

6.0