I've counted. 235 countries and territories. 30 are downright decreasing.
Plus:
> As of 2010, about 48% (3.3 billion people) of the world population lives in nations with sub-replacement fertility.[2] Nonetheless most of these countries still have growing populations due to immigration, population momentum and increase of the life expectancy
That was back in 2010 and fertility rates are only going down plus Covid has accelerated this so I'm willing to bet real money 50%+ of the world's population is living in countries with net natural population loss due to low fertility rates.
These things are very localized, look at the world map on that page to see where this growth is concentrated.
https://www.worldometers.info/world-population/population-by...
You have to scan down the list to #11 to find a country where the population is shrinking. And no, this cannot be due everywhere to immigration.