1960

7.7

1990

5.9

1980

7.0

1976

5.6

2013

7.5

2019

6.8

1991

7.0

1940

7.0

1981

5.8

2023

6.5

2021

6.9

2018

6.7

2000

4.8

2011

5.4

1988

6.3

2018

5.7

1984

6.7

2012

6.6

2021

6.8

2021

7.1