1981

5.2

1995

0.0

1997

4.5

1980

6.2

1993

3.0

1992

0.0

1984

6.9

1998

5.3

1994

1.0

1987

5.0

1994

7.0

1986

5.3

1996

0.0

1971

6.4

1999

5.9

1970

6.1

1991

0.0

1996

0.0

1992

3.4