1938

6.9

1938

6.7

2013

5.2

2016

5.8

1989

7.6

2013

7.0

2008

7.7

2001

7.5

2013

6.5

2017

6.2

2005

7.1

1972

7.6

2017

6.5

2018

6.3

2004

6.7

2005

6.8

2009

5.2

2013

6.5

1978

6.3

2008

6.4