2001

8.2

2018

7.6

2019

8.5

1980

7.1

2017

8.1

2014

7.4

2020

8.1

2015

7.9

2011

8.3

1972

8.7

1999

8.4

2015

7.8

1988

8.1

2017

7.4

2016

6.4

1986

7.1

2017

7.9

2016

5.6

2006

7.4

2015

7.3