2011

5.2

1998

8.1

2014

8.5

2008

7.6

1999

8.4

2015

7.3

1994

8.7

2009

7.6

1980

8.2

1994

8.5

1987

7.3

2017

7.6

2014

7.4

2018

7.5

2010

8.4

2012

8.2

2016

7.3

2016

7.9

2003

7.8

2000

7.8