1993

5.5

2006

7.0

2003

5.7

2007

5.7

5.3

2013

6.8

2001

6.7

2021

6.2

2012

8.2

2012

7.2

2023

6.9

2005

5.4

1984

6.5

2000

7.2

2013

6.5

2020

6.7

1975

4.5

2014

5.6

2017

5.9

2014

6.0