1975

4.5

2009

5.6

2021

6.2

2020

6.8

2003

6.4

1982

5.8

2020

5.6

2023

5.7

2018

6.0

1964

7.2

2023

7.1

2010

5.0

2000

5.6

1966

6.5

2024

7.3

2015

6.4

5.0

2004

7.1

1990

5.2

1952

7.0