1980

8.2

1982

7.7

1985

7.9

2004

8.0

1973

8.0

2016

6.3

2020

7.5

2010

8.2

2005

7.7

1998

7.5

2016

7.5

2008

5.8

2006

7.7

1999

4.8

2005

8.1

2013

6.6

1995

6.2

2019

7.1

2007

7.0

2012

8.0