1949

6.2

1992

5.0

2007

5.7

1996

6.5

2009

5.3

2011

6.6

2010

6.3

2017

7.3

2014

7.1

2006

6.8

2005

8.5

2021

6.1

2019

7.0

2020

6.2

2016

6.7

2019

6.7

2020

6.5

1993

5.4

2003

6.3

1988

6.2