1998

8.7

1987

7.3

2011

6.4

2019

8.2

2002

7.2

2020

8.1

2017

7.4

2016

7.3

2020

7.4

2014

7.3

2021

8.4

2007

7.6

2014

6.1

1989

7.9

2012

6.8

1957

7.8

2013

6.9

2019

8.3

2016

7.2

2010

7.0