There are 40.520.400 domains registred around the world, 1115 TLDs, and 458 Registrars. You can see all stats on ntldstats.
The market covered by each registrar varies a lot. The stats I'll show is the domains bought on different registrars.See the chart below:
At the top we have Godaddy with 6,378,961 domains (15,74%), followed by Namecheap with 5,673,915 domains (14%), and then all the others that don't reach 10%.
The table below shows the first 10 Registrars with their percentages:
Click on each Registrar, you'll see gTLDs stats.
For example, click on NameCheap:
.shop and .xyz get the higher result, followed by .site, .online, .store, .click.
Knowing Stats helps you to choose the best Registrar for your goals.
Take a look to another Stat provided by ahref: How many new gTLDs are there in ahref Top 100 websites?