1993

6.2

2017

6.0

1990

5.7

2015

6.5

1967

6.1

2003

6.8

2012

5.4

1958

5.5

1980

5.9

1977

5.4

2017

6.5

2013

6.6

2022

6.7

2001

6.8

2018

8.0

2023

6.2

1997

6.9

2001

7.2

2011

5.3