I think it's a downward trend for all F4. F4 season-on-season entrant numbers do 1 of 4 things:
Stay about the same (Australia, China, BRDC)
Increase then decrease (France, Sudamericana, Italy, ADAC, Japan)
Just drop (NACAM, British, SMP, SEA)
Or rise (Spain, US, UAE) but these are only 2 years old and will likely drop
Only 7 of the 45 championships run have seen an increase in numbers through a season so it's hardly surprising when 11 turn up to race 1 that they hit single digits in the later rounds.
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