6.4

2017

6.0

1984

9.2

2007

7.0

2002

8.4

2020

6.8

1968

6.9

2019

6.3

2008

6.9

2006

6.3

2010

6.5

1993

6.1

2014

6.5

2001

8.0

2012

9.4

1988

5.5

1982

8.0

2005

9.9

2020

8.3