1997

7.9

2012

7.0

2013

7.8

2015

7.5

2019

8.1

2014

7.9

2015

7.6

1972

8.7

2020

7.2

2001

5.8

2017

7.6

2013

5.8

2003

7.8

2014

8.0

2013

6.3

2010

7.8

1999

8.4

1994

8.7

1993

7.6

2016

7.0