1993

6.5

2023

7.0

2017

5.9

2006

6.9

1977

6.7

1955

6.2

2011

7.5

2002

9.2

2010

6.8

2008

7.4

1988

5.8

1977

6.3

2012

6.3

2014

6.6

2013

6.1

2009

7.3

2020

5.9

2015

7.6

2011

6.6

9.4