I'm not sure what do you intend this word to mean. Minimum wage is sustained in many countries for many years.
https://worldpopulationreview.com/country-rankings/minimum-w...
> looking as how even $15/hr isn't enough to cover rent basically anywhere where they actually pay $15/hr
That's a bit different problem. What UBI could do is let people migrate away from very expensive places because they would no longer fear they'll become destitute if they risk not being able to get a job in cheaper place.
https://ec.europa.eu/eurostat/statistics-explained/index.php...
It is about 12% in Poland (2018) and in most countries from the link it was less than 10%.
Thanks for the link though. I tried to find such chart and I failed.
I guess there's no point of discussing what is and what isn't small.