2010

7.8

2015

6.9

2025

6.8

1993

6.6

2020

8.1

1971

7.6

2008

7.6

1976

7.0

1988

7.5

2012

7.8

2002

7.9

2004

8.0

2009

7.2

2016

7.3

2008

7.9

1997

7.3

2014

7.3

2006

8.9

1998

7.3

2017

8.1