I’m presuming it was probably close to 100% White at its zenith in 1970. It must’ve ceased to be majority White in the ‘90s, dropped to 45% White in 2000 and 29% White in 2010. By 2020/25, it will be an almost all-Black enclave.
Re: Ferguson, MO: Their motto is “Proud Past, Promising Future”.
2000 Census: 44.75% white. 2010 Census: 29.1% white.
2020? Your guess is as good as mine, but if your guess is >2%, you need help.