1952

6.7

2012

8.0

2013

6.9

1988

6.1

2014

7.0

2007

5.7

2000

7.1

2005

6.8

2020

5.4

1970

6.3

1990

6.3

2008

7.4

2009

6.6

2009

7.3

2006

5.6

2002

6.8

2006

6.9

2005

6.8

2015

6.9

1986

6.3