全球足球联赛本土U21球员出场时间占比排名：澳超榜首（澳超居首：全球联赛本土U21出场时间占比榜）

Evaluating youth development in leagues

I'm thinking about reasons for youth talent development, like smaller squads and a cap/quota system encouraging local youth minutes. The transfer market also helps young Australians, and there's less relegation pressure which allows for development freedom.

I'll notice that compared to other regions, Latin American and Nordic leagues show a higher trend, while the Big Five leagues are lower.

I should ask the user what they want: a top-20 ranking, comparisons, or trends over the years. We can keep it concise with 4-6 bullets and mention we could fetch the latest numbers if necessary.