2021

8.1

2020

8.4

2019

8.7

1977

7.2

2013

8.2

1997

7.9

2012

6.8

1966

8.0

1991

7.6

1993

7.6

2004

8.2

2011

8.1

2008

7.5

1990

7.8

2002

8.2

2006

7.1

2018

7.9

2002

7.4

1991

7.6

2013

7.9