2007

7.9

2008

8.9

2017

8.1

2015

7.7

2020

8.5

2018

8.6

2010

8.1

2006

8.6

2016

8.5

2007

8.5

2015

8.4

1999

7.4

2020

7.3

2021

8.2

1966

8.0

2011

8.5

1990

6.9

2019

8.4

2012

8.6

1991

7.6