Gmail has stopped its evergrowing email storage space.
What was the storage space counter at before the move to 15GB constant? (Doesn't have to be exact)
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According to the official announcement for the new sharing of storage, Gmail had a 10GB limit while Google+ Photos and Google Drive shared 5GB before the change. (Confirmed on this other blog post which shows a timeline where the Gmail upper limit was expanded to 10GB on or about April 24, 2012.)
Whether that's what was displayed in the "evergrowing counter" is unknown.