1999

0.0

1997

7.4

2020

6.0

1987

6.6

2001

6.7

1992

7.0

2005

6.5

2009

6.9

1997

6.8

1998

6.9

1993

8.3

1982

7.4

2003

7.6

1988

0.0

1995

6.6