Many English words are borrowed from Latin, where they took a different plural. I'm interested in the most common case where we use the Latin plural "-um/-a". While most English speakers, now and historically, have never known Latin, I'm not sure whether these are generally learned all as a exceptions or as a rule for words ending in "-um". What nouns are consistently used in the plural with the Latin-style '-a' as opposed to the English-style '-ums'? From currently Latin-dominant to currently English-dominant (as of 2000), with the year being when it switched styles if there is one.

flagellums, flagella	n/a
equilibriums, equilibria	n/a
mediums, media	n/a
millenniums, millennia	1935 (E-L)
scriptoriums, scriptoria	n/a
vomitoriums, vomitoria	n/a
colloquiums, colloquia	n/a
dictums, dicta	n/a
atriums, atria	n/a
maximums, maxima	n/a
imperiums, imperia	n/a
continuums, continua	n/a
symposiums, symposia	n/a
consortiums, consortia	n/a
cerebellums, cerebella	n/a
honorariums, honoraria	n/a
crematoriums, crematoria	n/a
sanatariums, sanataria	n/a
minimums, minima	n/a
opprobriums, opprobria	n/a
compendiums, compendia	1945 (E-L)
podiums, podia	n/a
decorums, decora	1855 (E-L)
moratoriums, moratoria	n/a
sanatoriums, sanatoria	n/a
cerebrums, cerebra	n/a
referendums, referenda	n/a
arboretums, arboreta	n/a
emporiums, emporia	1952 (E-L)
solariums, solaria	1975 (L-E)
gymnasiums, gymnasia	1912 (L-E)
terrariums, terraria	1953 (L-E)
stadiums, stadia	1986 (L-E)
aquariums, aquaria	1988 (L-E)
auditoriums, auditoria	1885 (L-E)
forums, fora	1925 (L-E)
prosceniums, proscenia	1920 (L-E)
planetariums, planetaria	n/a
ultimatums, ultimata	1902 (L-E)
pandemoniums, pandemonia	n/a
condominiums, condominia	n/a
premiums, premia	n/a
museums, musea	n/a
geraniums, gerania	n/a
nasturtiums, nasturtia	n/a

I'm leaving off words like "agenda" and "data" which are commonly used as singular. Also words like "hoodlum" and "harmonium" which aren't Latin, and words where the plural doesn't make much sense ("cesium", "Belgium").

[1] This varies by topic. If I'm buying shirts I might be looking for "the mediums" but in complaining about campaign coverage I would blame "the media".