2007

4.9

2012

6.8

2018

5.9

5.0

2021

7.0

2009

6.6

1992

6.3

2006

3.4

1987

5.7

1985

7.2

2020

6.4

2006

6.1

2022

5.2

2020

6.7

1937

7.1

1992

6.7

1980

7.2

2023

5.8

2006

6.6

2023

5.3