1993

7.6

2008

6.3

2013

7.1

1966

7.6

1994

7.7

2014

5.9

2023

5.6

2009

6.0

2019

6.6

1994

8.9

1976

7.8

2011

5.2

2015

6.9

1974

7.0

2018

5.9

1999

6.5

1958

7.6

2012

6.2

2017

7.3

2004

5.6