2007

8.0

2014

8.5

2018

7.5

2009

7.6

2015

7.3

2016

7.9

2017

7.6

2017

6.7

2019

7.7

2016

7.3

2015

7.5

2019

8.1

1980

8.2

2014

7.9

2018

8.2

1994

8.7

2016

7.6

1972

8.7

2009

7.7

2009

5.7