Given they've only been published for the last 4 years, it's too early to make any meaningful comparisons, but it might be interesting in another 5 years or so to look at academy performance vs 1st team & perhaps overall spending as well.
I'd like to see all available 4 years side-by-side: if creche performance is a measure of future 1st team success, two anomalies in there are Cas & Hudds.