1994

6.7

2002

7.9

1989

8.5

1973

7.0

2013

7.0

2014

7.3

2016

6.9

2018

7.3

2006

6.9

2017

7.9

2015

6.0

2018

7.4

2009

7.7

1965

7.3

1987

7.5

2004

8.4

2007

7.2

2010

7.1

2018

7.1

2019

7.8