I don't have a single source, but it is not hard to figure out. Some of it is in MichKa's posts on Google Groups, and notice for example the >1 year long gap between Jet 4.0 SP5 and SP6.
And the 2023 was a stripped down version only available in Europe as well, that + the track change is why I looked up the 2017 numbers to compare properly.
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