2005

6.5

1976

6.6

2008

6.8

2003

0.0

2006

7.4

2005

6.6

2002

6.5

2003

6.5

1997

5.7

2008

7.3

2002

7.0

1990

6.4

1990

6.0

1993

7.3

2002

6.2

2001

6.8

1978

6.3

1991

6.2

1988

6.2

2004

3.7