2014

7.4

2016

7.1

1995

5.1

2004

6.0

2017

5.3

2006

6.9

2005

6.0

2006

6.6

2003

7.5

1971

7.7

1957

8.5

2019

6.9

2012

6.8

2020

3.5

1972

7.2

1998

8.3

2001

7.8

2001

7.9

2004

8.0

2005

7.8