Get the percentage of potentially validating resolvers in a specific country. Note however, that the fact that a resolver asks for DS or DNSKEY records does not necessarily mean that it is actually validating.
Impala Query:
select dnssec.number / total.number as percentage from ( select count(distinct src) as number from dns.queries where country='CH') total join ( select count(distinct src) as number from dns.queries where edns_do=true and (qtype = 43 or qtype = 48) and country='CH' ) dnssec on 1=1;