1980

8.4

2005

4.3

2013

6.6

2003

5.8

2001

7.2

1993

5.5

2018

7.8

2020

7.0

8.0

1986

6.3

2014

6.5

2006

6.4

2009

6.5

2020

6.7

2002

6.5

2015

6.8

2004

6.0

2010

6.6

2006

5.5

2024

5.9