1981

4.2

1998

6.2

1990

0.0

1988

8.3

1978

0.0

1979

5.0

1987

6.0

1971

0.0

1986

6.1

2005

0.0

1987

0.0

1990

4.4

1975

0.0

1987

5.3

1985

3.0

1996

6.6