2015

6.7

1995

7.8

2006

8.0

1986

8.4

2011

8.1

2004

8.3

2008

7.4

2013

7.6

1993

6.6

2012

6.8

2020

7.9

2013

8.1

1976

7.8

2006

7.5

1998

7.3

2017

6.8

1973

6.8

2001

7.8

2018

7.6

1994

7.0