2006

6.4

2008

7.4

2009

6.6

2014

6.5

2012

5.7

1941

6.0

1990

6.3

2013

6.8

2015

7.8

2000

7.1

2018

7.0

2010

5.8

1986

6.3

2015

7.1

2002

6.8

2013

6.9

1970

6.3

1995

6.5

2007

5.6

2006

6.9