1973

8.0

1988

5.9

1981

4.9

2010

7.1

2013

6.5

2013

6.9

2020

6.0

2012

7.7

2007

6.7

2016

6.9

2013

8.4

2015

7.0

2001

6.7

2012

6.3

2014

7.4

2011

7.3

2001

8.9

2018

6.0

2002

5.8

2020

9.4