1989

5.9

2009

5.0

2006

7.0

2012

5.7

2015

7.6

7.8

2008

7.5

2010

7.1

2001

7.0

2023

6.4

2006

6.3

2012

6.9

2022

6.3

1932

6.4

2013

6.5

2004

6.7

1965

7.9

2018

6.4

2005

5.4

2021

7.7