1967

6.6

1992

7.0

1989

5.2

2018

6.1

2011

7.2

2000

5.2

2006

8.1

1997

6.3

1982

5.2

2008

5.2

2016

6.9

2007

10.0

2011

6.4

2006

6.5

2020

6.2

2021

7.2

2016

5.8

2001

4.3

2017

7.9

1966

6.7