1989

7.8

1990

7.5

2018

6.9

2017

7.7

2015

6.8

1992

6.8

2004

7.3

2007

6.3

1999

7.6

1965

6.8

1967

6.7

2014

7.2

2023

6.4

2017

7.6

1939

7.9

2022

3.5

2021

6.8

2020

7.1

2017

2.7

1982

6.1