2020

6.7

2015

6.1

2021

6.6

2013

6.6

1999

5.6

1984

7.3

1983

6.9

2001

7.0

2006

6.7

2000

6.2

2017

7.2

2006

6.4

1973

7.7

1995

5.0

2019

7.9

1993

4.6

2005

5.7

2021

6.2

1967

6.8

1957

6.9