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The Internet Archive is your friend
The total number of free products in 2015
In 2018
In 2021
And now currently
As for PWYW
It grew from 506 in 2015
To 3.103 today
Out of 140,000+ products
That would be a good bet as the order number undoubtedly relates to their internal accounting shared across all sites. You could get a sense of the proportion between the different sites by looking at their respective metal levels.