2007

8.5

2004

8.1

2012

6.8

1976

7.9

2015

8.0

2016

7.8

1972

7.7

1982

7.9

1984

7.2

2017

7.5

1983

7.7

1983

7.3

2011

7.9

1999

8.2

1984

8.5

1983

7.5

2016

8.0

2018

7.4

2020

6.3

2009

7.7