1922

7.7

1931

7.2

1932

7.3

2005

7.0

1998

5.8

2009

5.8

2005

6.2

1987

7.1

2012

4.4

2018

4.6

2005

7.0

2001

6.0

1994

7.4

1977

3.0

2002

6.2

1997

6.8

2005

6.7

1988

4.2

2021

5.8

2023

1.5