1997

6.0

2007

6.7

2008

6.9

2021

6.2

2010

7.1

2001

6.4

1990

7.0

2020

6.1

2004

5.7

2013

7.6

2010

6.8

2012

5.5

2000

7.3

1998

6.0

2013

7.0

2016

5.8

2009

6.4

2005

8.4

2011

6.7

2016

7.3