2016

8.4

2019

6.7

2022

5.8

2010

7.9

2011

6.4

1997

7.1

2009

5.9

2022

6.0

2020

6.7

2004

8.5

2003

7.6

1972

7.5

2017

6.3

1979

6.2

1988

8.0

1992

7.3

2009

7.8

2012

8.1

2007

5.0