1984

0.0

1983

6.9

1987

5.9

2004

5.2

1985

4.4

1993

0.0

1997

6.7

1967

0.0

1998

3.4

1994

5.8

1981

7.5

1995

3.5

2006

4.1

1991

4.5

2001

6.0

1998

5.9

1992

5.5

2000

6.6

2006

5.3

1979

4.0

1968

3.5

1988

4.1

1982

4.4

1986

5.6

1994

2.6

2007

5.6

1994

4.7

1990

5.0

1962

7.0

1993

7.0

1969

0.0