1987

5.5

2010

6.8

1977

6.3

2007

8.0

1975

7.1

2004

7.2

2010

8.1

2002

7.5

2012

7.3

2014

6.6

2014

5.7

2016

6.9

2017

7.5

2022

6.9

2018

8.4

2015

8.3

2014

7.3

2017

7.2

1988

6.8

2020

6.9