2006

8.0

1970

7.0

2008

5.2

2012

5.7

1975

6.4

1988

7.6

2017

5.5

2010

8.9

7.9

2013

8.1

2007

7.0

1968

7.6

2010

7.2

2018

6.0

2009

7.1

2009

7.6

2020

7.3

1969

6.2