1997

4.6

1954

7.1

2005

5.9

1995

7.0

1999

6.0

2007

4.7

1999

6.3

2007

6.5

2002

5.5

1991

6.7

2009

6.9

2000

7.8

2003

5.1

2006

6.1

2001

1.0

1983

5.0

2008

5.5

2007

3.2

1988

5.8

2003

5.0