How do you even show that systematic racism exists?

-edit to assuage the presumptuous-

Assuming systematic racism does exist in US industry(I'm not from the US or live there) and a solution is provided to lessen it. At what point can you say that it no longer exists?

I don't think there will ever come a time where the demographics of Executives In Industry will match the demographics of a nation. There are a million different factors at play that have nothing to do with race, I think its not a very useful measure. But without that, what else can you go by?