1983

6.6

2014

5.9

1995

6.2

2009

6.8

2004

5.6

2000

6.4

2006

0.0

2023

6.5

2002

6.0

2008

6.3

2015

7.1

2014

5.3

2017

6.0

2014

6.7

1979

7.0

2010

6.4

2001

7.4

2007

7.4

2.0

1988

7.4