1987

7.3

2019

8.1

1999

8.4

2017

7.6

2014

7.9

2013

7.8

2020

7.2

2012

7.0

2017

7.6

2021

7.9

1994

8.7

1972

8.7

2016

7.0

2018

7.6

2010

7.8

2019

8.5

2015

7.5

2003

7.8

2008

8.1

2016

7.0