This is an off beat subject. I've researched this on different occasions and can't find and real data.
Apparently there are several different modes in use in the EU, European Union, for their FRS like service, PMR446.
There is narrow band FM, Tier 1 DMR and dPMR which is very similar to NXDN.
What I was trying to find out which one seems to be the more popular digital mode in use. These modes also appear to be used for commercial radio service as well at higher power.
I'm not aware of any dPMR mode radios being used in the US for commercial applications.
PMR446 White Paper.pdf