2019

7.1

2013

5.8

1997

7.9

2017

8.2

2014

8.5

1994

8.7

1972

8.7

2014

7.7

2015

7.8

2016

7.6

2009

7.6

2018

8.4

2016

7.0

2019

8.1

2018

8.0

2006

7.4

1976

8.1

2014

7.8

2018

7.4

2017

8.1