1984

0.0

1983

6.9

1987

5.9

2004

6.0

1985

4.2

1993

0.0

1997

6.7

1998

3.2

1994

5.8

1981

7.5

1995

3.5

2006

4.1

1991

4.6

2001

6.0

1998

5.7

1992

5.5

2000

6.6

2006

5.3

1979

4.0

1968

3.5

1988

4.0

1982

4.1

1986

5.5

1994

2.7

2007

5.6

1994

4.6

1990

4.8

1962

7.0

1993

7.0

1969

0.0