2006

6.9

2017

7.9

2021

10.0

2004

7.7

2023

6.8

2015

6.0

1989

8.5

2013

7.1

2009

5.5

7.0

2014

8.0

2019

8.2

2018

7.8

2020

5.0

2019

6.0

1986

6.5

2003

7.0

1952

5.5

1980

6.3

2012

8.0