1973

5.7

2011

5.6

2005

5.5

1982

8.0

2012

8.9

2004

6.0

2003

5.0

1972

6.2

2019

6.8

1998

7.1

2010

6.6

2018

5.6

2014

5.9

2023

6.5

2011

5.8

2010

7.3

2006

5.5

6.4

2003

6.6

2009

7.1