1992

6.9

2005

8.1

2008

8.9

1998

7.9

2019

8.1

2002

7.5

2006

7.4

2011

7.6

2020

7.2

1966

7.6

2009

8.3

2013

8.1

2003

8.2

2001

7.5

2021

7.8

2014

7.1

2001

8.0

1996

8.1

2010

8.1

2016

8.2