2010

6.8

2013

6.5

1990

7.0

2013

7.0

2014

7.0

2008

5.2

1990

7.5

2004

7.3

1981

6.0

2009

6.6

2012

6.4

2007

6.1

2007

6.9

1967

6.6

2011

6.9

2011

6.3

2009

5.6

2021

7.7

2006

7.6

1970

6.1