2012

6.2

5.4

2017

5.9

2013

8.1

2007

5.7

1975

4.5

6.3

2000

6.0

2004

7.9

2014

6.8

2015

7.0

2005

5.8

2016

6.2

1999

6.3

1964

7.3

2012

7.8

2018

7.2

1996

7.5

2012

7.2

2005

6.4