2017

6.8

2018

6.6

2004

7.3

2008

8.8

2000

6.9

2016

6.9

1989

8.3

1976

8.1

2010

7.7

2014

8.5

2010

8.4

2014

7.9

2015

7.9

2017

7.6

2019

7.6

2017

7.6

2016

7.8

2008

8.5

2014

8.4

1979

8.2