2015

6.6

2013

7.8

2016

7.0

2019

8.1

2019

7.0

2018

7.6

1978

7.6

2006

6.7

2012

7.0

2021

7.2

1990

7.4

1984

7.1

1958

8.2

2005

5.2

1972

8.7

1998

7.2

1970

7.3

2014

8.0

2010

8.4

2017

8.1