1990

7.9

1998

8.6

1981

8.3

2009

7.4

2018

9.1

2011

7.3

2014

4.3

2014

6.6

2024

6.0

2013

7.1

2016

7.0

2012

6.8

2012

7.5

2016

6.2

2004

6.2

2005

6.6

2017

7.6

1998

7.2

2020

6.4