There must be a dashboard, probably using Dashiki, that will show how many articles were translated with each of the translation engines.
The basic query is something along these lines:
select cxc_origin as engine, count(distinct(cxc_translation_id)) as translations from cx_corpora where cxc_timestamp between 20180901000000 and 20181001000000 group by cxc_origin;
And we'll probably want a line chart with a line for each engine.