2008

0.0

1997

6.6

2000

7.6

1997

4.2

1990

6.4

2006

6.9

2005

5.9

1998

7.1

2011

6.3

1995

6.5

1999

6.2

2009

5.2

1996

6.7

1997

3.8

2005

7.1

2009

7.6

1991

6.8

1994

6.8

2008

4.2

2011

6.9