1967

0.0

1998

3.2

1999

7.0

1995

3.5

1966

4.7

1988

4.0

1985

5.5

2004

4.3

1984

5.9

1986

7.0

1991

4.3

1987

4.2

1982

4.1

1986

5.5

1992

4.6

1981

4.4

1983

4.4

1993

3.3

1994

2.7