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The 1900 census was taken and tabulated for the entire Hungary (including Croatia-Slavonia) by linguistic groups specifying seven languages spoken by most speakers in the kingdom ([1]). Those were Hungarian, German, Slovak, Romanian, Ruthenian, Croatian, and Serbian while everyone else was lumped together under "egyéb" meaning "others".
This means that the 68,2% in 1900 includes mostly Italians, but also Slovenes, French, English etc. as well as those who declared their language was anything other than the seven listed above. The 1910 designation of "Croatian-Ilyrian" might be an indication that a significant number of people declared their language as "Ilyrian" in 1900 as well and ended up with "others".
The 1910 census was also taken by language (hence "German" and not "Austrian"). Apparently data for 1910 is more detailed. When one considers overall growth of population of about 20% between 1900 and 1910 and similar rates of growth of speakers of German and Hungarian the numbers seem to be consistent and it is possible (likely perhaps) that the 1910 percentages would also apply in 1900 if they were not grouped like they are, i.e. that there was about 47% of Italians in 1900 too.--Tomobe03 (talk) 16:19, 28 February 2021 (UTC)Reply