1999

0.0

1997

8.2

2020

6.0

1987

6.6

2001

6.7

1992

7.0

2005

6.3

2009

6.8

1997

6.8

1998

6.9

1993

8.2

1982

7.3

2003

7.5

1988

0.0

1995

6.6