1996

5.4

2000

6.3

2006

6.3

1956

6.2

2012

5.6

1989

5.9

2013

6.1

1947

7.0

1990

6.1

2010

6.1

2020

5.3

2018

7.6

1951

7.3

2012

7.5

1965

7.0

2023

6.3

1970

6.0

1990

7.3

2019

5.8

1967

6.9