2005

6.8

2009

6.6

2006

6.4

2013

6.1

1988

6.3

2024

5.8

2007

6.9

2010

7.2

1977

6.7

2009

6.0

1958

7.2

2008

6.8

2004

7.5

2007

6.4

2014

7.0

2013

6.9

2009

6.1

1996

5.4

2017

6.5

2002

9.1