1973

6.6

1988

6.6

1982

6.9

2013

6.8

2007

7.6

1959

7.2

1997

6.6

2023

5.4

1999

7.7

2006

6.0

2002

6.3

2017

6.4

1932

5.2

1996

6.9

2006

7.2

2002

5.9

2006

7.4

2004

7.5

2021

7.0

2024

6.7