2002

4.7

1993

6.3

2001

5.8

2015

6.6

2019

6.2

2017

6.7

7.8

2018

7.2

2006

6.1

2011

6.4

2013

6.4

2010

6.4

2021

5.7

1975

4.9

2015

6.6

2017

5.5

2006

5.9

2020

6.3

2025

7.0