1977

0.0

1988

4.7

1989

8.1

1989

5.6

1986

6.0

1972

5.4

1983

6.9

1978

0.0

1994

3.5

1992

7.0

2003

10.0

1983

7.0

1987

7.8

1980

0.0

2005

6.4

1976

7.0

2007

7.6

1996

1.0

1975

4.7

1994

7.8

1997

7.5

1997

7.0

1970

6.1

1996

6.1

1991

5.7

1978

0.0

1999

7.2

1979

0.0

1978

6.7

1973

5.6

1994

8.0

2004

0.0

1976

0.0