1996

6.4

2020

6.3

2005

8.2

2008

6.6

2008

6.8

2004

7.4

1997

7.0

1996

4.3

1994

0.0

2011

0.0

2001

4.3

2003

7.2

2005

7.0

1999

6.0

1998

7.9