1986

5.0

1994

7.0

2005

6.8

2006

7.1

1999

7.8

2003

7.2

2001

6.7

2006

6.3

1982

2.3

2008

5.7

2005

6.2

2008

1.0

2002

7.6

2006

6.6

2008

5.8

1989

6.6

2006

6.0

2005

6.7

2005

6.8

1996

6.5