1967

0.0

1998

3.4

1999

7.0

1995

3.5

1966

4.7

1988

4.1

1985

5.7

2004

4.2

1984

6.0

1986

7.0

1991

4.5

1987

4.3

1982

4.4

1986

5.6

1992

4.6

1981

4.5

1983

4.5

1993

3.4

1994

2.6