1993

4.2

2006

6.1

2018

6.8

1988

7.8

2016

8.1

2014

6.5

1998

6.6

2010

6.4

1994

6.9

2013

6.7

2013

5.7

1997

5.5

2008

6.5

1989

6.7

2004

6.2

2021

6.1

2017

7.6

2009

7.0

2022

2.0

2002

2.0

2012

6.3