2015

6.1

1983

5.0

1999

6.0

1978

6.8

1987

4.3

2014

6.4

2014

7.9

1995

7.3

1992

7.4

2013

8.3

2004

8.1

2011

8.0

2022

7.1

1981

5.7

2012

7.0

2012

6.1

2017

8.4

2020

7.1

1957

5.2

2016

7.5