1966

7.3

1987

7.5

1989

6.2

2020

3.3

2010

6.5

2005

7.0

1990

7.7

2014

7.5

2008

5.9

2018

6.4

2023

5.7

2008

6.9

1987

5.7

2021

7.1

1952

6.5

1995

6.3

1993

7.4

1952

6.7

2015

5.5

2006

6.8