Census of 2021 has shown, that in the past 10 years (meaning, a period from 2011 to 2021) the population of Croatia has decreased by 396 360 people, which is equivalent to about 9.25% of an overall population.
That is, by far, the biggest population decrease, comparing to the census of 1991 to 2001, as well as the post-war years, when the population of Croatia has only decreased by 7%.