1984

0.0

1983

6.9

1987

6.1

2004

5.2

1985

4.4

1993

0.0

1997

6.8

1967

0.0

1998

3.4

1994

5.8

1981

6.8

1995

3.5

2006

4.6

1991

4.5

2001

6.0

1998

5.8

1992

5.5

2000

7.1

2006

5.3

1979

4.0

1968

3.5

1988

4.3

1982

4.6

1986

5.8

1994

2.5

2007

5.6

1994

4.8

1990

5.4

1962

7.0

1993

0.0

1993

7.0

1969

0.0