CENTR, an organization representing European country code top level domain (ccTLD) operators, worked with Oxford Information Labs to analyze language use in ccTLDs.
All told, it analyzed ten ccTLDs representing 16.4 million domains from territories in which English is not the primary language.
The principal languages spoken in the country or territory comprised at least 64% of the content in the zone, and the average rate per TLD was 76% (see chart above).
The numbers are even higher for domains that allow internationalized domain names.
You can get a detailed study report by downloading the report, which analyzes .cat, .ch, .dk, .nl, .nu, .pt, .ru/.рф, .se, .sk, on CENTR’s website.