2005

5.4

2005

6.7

1997

4.0

1997

6.0

1992

6.3

2008

6.8

2008

0.0

1956

4.6

1998

7.5

1990

7.0

2007

7.9

2001

7.1

1996

6.7

2007

6.7

1995

6.9

1991

6.6

1994

5.2

2008

6.4

2006

6.9

2007

7.1