1975

0.0

1989

4.3

1969

6.9

1982

6.7

2008

6.0

2018

0.0

1970

3.0

2006

6.2

1991

3.5

1993

3.5

1968

4.2

2008

0.0

1994

0.0

2001

6.6

1997

5.3

1997

6.9

1998

7.1

2000

5.8

2001

2.7

1992

1.0