2015

7.5

2012

8.2

2014

8.5

2015

7.8

1994

8.7

1972

8.7

1997

7.9

2018

7.4

2009

7.6

2006

7.4

2018

8.4

2012

7.8

1994

8.5

2014

7.7

1976

8.1

1994

8.3

2014

7.8

2016

7.0

2017

7.9

2019

7.1