1995

8.2

1988

7.7

2016

6.4

1979

8.1

1948

5.8

1941

6.5

2017

6.2

2004

5.0

2014

7.1

2018

6.4

2021

4.0

2015

7.3

2019

5.8

2018

7.2

2017

6.5

2006

4.0

2015

7.1

2002

6.2

2000

6.2

2008

6.5