2009

6.8

2013

7.6

2006

6.6

2004

5.9

1991

7.7

2014

6.2

1961

7.2

2010

6.8

1951

6.2

2011

9.1

2021

7.5

2010

6.7

2002

5.8

1996

6.8

2010

6.9

2013

5.9

2012

6.4

2009

5.5