1984

7.2

2011

9.8

2016

9.3

1980

6.6

1982

6.4

2008

6.3

2020

7.8

1994

5.4

2008

6.7

2002

6.0

1998

7.1

2007

5.0

2009

6.6

2009

6.0

2010

6.2

2018

5.5

2021

6.9

2014

3.0

1999

5.6

2005

6.4