2001

8.8

1985

7.7

2007

7.4

2019

7.0

2007

7.8

2012

7.4

2009

7.0

2012

6.3

2000

6.9

2009

7.7

2008

7.7

2013

7.6

2006

7.4

2008

7.2

1996

7.5

1980

8.6

2005

7.9

1983

8.0

2013

8.0

2011

6.7