Info: https://en.wikipedia.org/wiki/List_of_languages_in_the_Eurovision_Song_Contest

Since 1999 there has been no rule stating that countries have to sing only in their own national languages.

In 2021 lyrics in Sranan Tongo were sang for the first time.
In 2022 lyrics in Latin were sang for the first time.
In 2023 no new languages appeared.

In 2024 lyrics in Azerbaijani were sang for the first time