EURid released the 2015 EURid-UNESCO World Report on Internationalised Domain Names. According to the findings of the report, IDNs represent 2% of domain names registered worldwide. .eu is in the Top-20 TLD list for IDNs registered at the second level.
The sample of 1.7 million domains comprised IDNs in gTLDs (both top and second level), and .eu (second level).
The report found that on average, 30% of IDNs (regardless of level) were both “in use” (ie had active name servers) and had sufficient web content to identify the language. In other words, more than half of IDNs with active name servers do not have web content, so measuring active nameservers alone would overstate the numbers for language of web content.
Source
The sample of 1.7 million domains comprised IDNs in gTLDs (both top and second level), and .eu (second level).
The report found that on average, 30% of IDNs (regardless of level) were both “in use” (ie had active name servers) and had sufficient web content to identify the language. In other words, more than half of IDNs with active name servers do not have web content, so measuring active nameservers alone would overstate the numbers for language of web content.
Source