2014

8.4

1987

7.7

1989

5.9

1982

7.5

2018

7.8

1993

6.8

1979

7.0

2013

6.8

2015

7.7

2017

6.5

2011

6.9

2005

6.8

2019

8.0

2000

8.0

2009

7.2

1984

7.8

2006

7.4

2004

6.4

2009

7.5