1996

7.1

2010

7.6

2019

7.8

2020

8.4

2002

7.9

2018

7.8

2014

7.3

2004

7.4

2000

8.5

1987

7.7

1993

8.0

2013

7.3

2016

7.1

2014

8.0

2009

8.0

2007

7.9

2017

7.6

2015

6.9

2012

7.8

1986

7.7