2008

8.9

2005

8.1

1996

6.6

1989

7.9

1963

5.7

2013

7.7

1987

8.4

2014

7.8

2007

7.7

2019

6.4

2016

7.0

2015

8.3

1996

6.8

2018

8.2

2011

8.5

2010

7.1

2011

7.4

2017

7.6

1981

8.0

1963

7.8