2007

4.8

2012

7.5

2006

7.4

2008

7.6

2011

8.5

2015

8.3

2006

8.2

2022

8.4

2001

8.0

2013

7.3

2007

7.1

1990

7.9

2004

7.4

2016

7.8

1996

6.8

2009

8.0

1993

7.9

2010

7.5

1993

5.6

1988

8.1