1975

6.4

2019

6.5

2020

6.7

2016

6.7

1980

5.9

2014

6.7

1993

6.5

1963

6.9

1993

6.5

2014

6.8

1965

6.3

2001

6.8

2006

6.8

1969

6.6

1998

6.1

2004

5.7

1978

6.9

2011

6.6

2023

6.3

2017

6.5