1993

6.9

2006

5.8

2017

7.2

1981

5.5

2009

6.5

2002

5.3

2020

5.2

2012

6.0

2014

5.3

2016

6.5

1997

5.7

2006

5.5

1996

6.3

2006

7.4

1984

7.5

1998

5.5

2005

4.7

2014

6.6

2013

6.3

2019

6.0