2009

7.0

2012

6.4

2015

7.1

1991

5.9

2002

6.9

1990

5.5

2006

6.0

1947

6.7

2009

6.6

2003

7.0

2003

6.4

2006

7.6

1999

5.9

2002

6.1

2010

7.2

2008

6.8

2011

6.6

2011

7.0

2009

6.5

2006

6.9