2003

6.7

1988

6.1

1980

8.4

2009

7.4

2007

6.4

2006

6.4

2016

7.5

2000

6.3

2009

6.8

2017

7.6

2008

7.4

2008

6.6

2012

6.4

2013

7.7

2012

6.6

2010

6.7

1943

8.2

2005

5.8

1975

7.8

2008

7.6