1993

6.5

1998

6.1

2008

5.8

2011

6.6

2020

6.5

2004

6.4

2001

6.8

2017

6.9

2021

5.9

1971

6.0

1965

6.3

1963

6.9

1993

6.5

2014

6.3

1991

6.2

2003

6.8

2019

6.5

1995

5.6

2004

6.9

2017

6.5