1977

7.2

1998

7.1

2018

8.3

2008

8.9

2019

8.7

2011

8.5

2017

8.4

2016

8.6

2010

8.1

1994

8.4

2022

8.3

2015

8.7

2019

8.4

2001

8.6

2013

8.5

2013

8.1

2013

8.7

2011

8.3

1995

8.6

1989

8.0