1988

7.0

2008

8.1

2014

8.4

2010

8.2

1982

7.9

1997

7.9

2019

8.5

1985

8.3

2011

6.8

2010

8.4

2013

8.0

2006

8.2

1977

8.2

2014

8.0

1978

7.6

2016

7.6

1994

8.7

2015

7.7

2017

7.3

2022

7.7