1948

5.2

1970

6.4

2020

5.8

2018

6.7

1975

6.3

2021

8.2

2017

9.5

2013

8.3

1939

6.3

1987

5.5

2015

7.8

2007

4.3

1952

4.0

2006

7.5

1963

6.0

2014

6.2

2014

5.4

2004

7.9

1994

5.7