Yet another use of the Recurve tool available with GID @ https://gen-img-dec.sourceforge.io/ or https://github.com/zertovitch/gid : the long-term reconstruction of the Harpex index, which tracks worldwide container shipping prices.

The Harpex chart since 2001 is available for free on the Harper Petersen & Co Web site, but the data is freely available only for the last 3 years.

Solution: use the Recurve tool for digitizing the long-term chart till 2018.

Bonus: I've found an article with a Harpex chart from 1995 to 2010. Another opportunity to apply Recurve!

All in all (two digitized charts, plus data since 2018):