1992

7.1

2006

6.5

2006

7.8

1999

6.6

2006

6.6

1993

6.1

2001

7.8

1991

7.7

2003

0.0

1984

6.7

2006

6.0

2002

0.0

1997

6.7

2003

7.6

2009

7.4

1994

6.0