1979

6.0

1976

6.7

1982

7.6

1994

4.4

1993

4.3

1996

5.5

1983

4.8

1991

5.2

1980

3.8

1991

3.9

1991

3.0

1990

2.5

1984

7.2

1995

7.3

1997

6.7

1980

7.3

1986

7.1

1998

3.9

1994

4.3

1986

4.4

1985

10.0

1993

4.6

1981

5.0

1987

3.4

1980

0.0