1996

6.5

2017

4.8

1964

7.0

2016

7.1

2010

6.6

2015

6.8

2018

5.3

1997

6.0

2010

5.1

2015

7.9

2012

7.3

2011

6.1

2012

7.8

2015

5.1

1996

7.0

2011

6.0

2020

6.2

2007

6.7

2015

5.2

2021

6.1