2012

7.1

1989

5.9

2008

5.5

2009

6.7

1958

7.0

1997

6.0

2007

7.3

2012

6.7

1971

7.2

2016

6.6

2009

6.2

1998

6.1

2014

6.8

2012

6.1

2016

5.3

2003

6.4

1970

6.3

2005

4.2

2003

6.9