The top 10 ccTLDs, as of March 31, 2021, were .tk, .cn, .de, .uk, .nl, .ru, .br, .fr, .eu and .it.
As of March 31, 2021, there were 308 global ccTLD extensions delegated in the root zone, including IDNs, with the top 10 ccTLDs comprising 64.3% of all ccTLD domain name registrations.
Source: ZookNIC, Q1 2021