1992

6.2

2005

7.8

2010

6.9

2009

7.7

2010

7.2

2010

5.6

2012

3.3

1973

5.0

1998

7.1

2003

8.3

2002

6.4

2007

7.3

2027

0.0

2017

6.1

2016

6.6

2011

6.1

2020

6.8

2009

6.6

2005

6.5