2008

6.2

2000

6.0

2012

7.7

2003

7.3

2010

7.8

2009

7.7

1968

7.4

2007

6.2

2009

4.8

1981

6.6

2019

7.4

2020

6.8

2016

7.0

2013

5.7

2013

6.0

1987

7.4

2016

7.6

1999

8.4

2002

9.0

2017

6.9