2013

4.9

2006

3.7

1999

7.2

2001

7.2

2014

9.5

2010

6.6

2018

5.9

9.4

1971

6.0

2007

8.1

1999

7.4

2021

7.4

2015

5.1

1970

6.0

1952

6.7

2011

7.0

7.8

1938

6.5