1972

7.4

2005

5.1

1990

7.2

2005

8.6

1984

7.0

2017

6.5

2008

5.6

1980

5.3

1917

7.3

1983

6.9

2012

5.7

2007

9.0

2019

6.8

1988

6.2

1952

6.7

2025

6.7

1992

5.7

2004

5.3

1964

7.0

2020

6.1