2012

5.4

1980

8.2

2015

7.3

1998

8.1

2018

7.5

2003

7.8

1987

7.3

2014

8.5

2005

8.1

1999

8.4

2009

5.8

2016

7.9

2017

7.6

2005

7.8

1988

7.8

2019

7.7

1972

8.7

1940

7.1

2013

6.8

2004

7.7