with solutions as (
select
(json -> 'solutions' ->> -1)::jsonb as winning_solution
from solver_competitions
where id >= 4929771 -- The first batch containing the field `uninternalizedCallData`
)
select 100.0 * sum(case when winning_solution -> 'uninternalizedCallData' is null then 1 else 0 end) / count(*) as proportion_uninternalized
from solutions
Results in ~71%