2014

6.5

2012

7.2

2013

6.1

2007

6.7

2015

6.8

2008

5.7

2000

5.5

2009

7.1

1999

6.6

2014

8.0

1941

6.2

2005

5.3

1984

6.7

2018

5.3

2021

5.4

2021

8.3

2021

10.0

1975

8.4