1998

6.0

2019

6.5

1980

5.9

2011

6.6

2014

7.0

2003

6.8

2006

6.1

2020

6.7

2004

6.4

1999

5.9

1975

6.8

2007

7.4

2012

5.7

2009

5.9

2023

6.1

1988

6.4

1969

6.6

2021

5.9

2021

6.1

2011

6.6