2014

4.6

1995

5.6

2000

6.9

2008

5.2

2008

7.0

2007

4.9

2005

5.3

2005

5.8

2001

6.3

2005

5.8

2005

5.3

1996

6.4

1952

7.6

2006

5.9

1980

10.0

2011

3.1

2001

7.0

2008

5.0

2009

6.5

2002

4.7