2009

6.5

1989

5.9

2001

6.4

2012

6.9

2013

6.0

2013

5.6

2002

5.0

2011

7.5

2003

6.7

2014

7.3

2019

6.7

2010

5.8

2006

5.6

2004

6.6

2012

5.6

2005

6.8

1996

6.5

2014

5.0

1971

6.8

2009

6.7