1949

7.0

2011

6.8

1964

7.3

1965

6.7

2005

6.5

2013

7.5

2014

6.2

2022

5.6

2014

6.5

2010

7.1

2010

6.4

1999

6.3

2008

6.9

1997

6.5

2010

6.7

2008

7.3

2011

5.3

2014

6.8

2013

5.9

2012

7.2