1967

0.0

1998

3.4

1999

7.0

1995

3.5

1966

4.7

1988

4.3

1985

5.9

2004

4.2

1984

6.1

1986

7.0

1991

4.7

1987

4.4

1982

4.6

1986

5.8

1992

4.7

1981

4.8

1983

4.6

1993

3.4

1994

2.5