2011

6.4

2013

5.4

2001

4.3

2016

7.3

2015

7.9

2004

7.1

2015

5.0

2012

7.8

2003

7.2

2017

7.2

2013

7.0

2016

6.2

1993

7.6

2016

7.5

1990

6.5

2005

6.1

2016

7.0

2007

6.3

1970

7.4

2019

7.0