About 40% of abortions are white. About 28% are black. There are about 600,000 abortions per year according to the CDC. That would mean, if there was no legal abortions, there would be 240,000 more whites per year (.40x600,000), while only 168,000 more blacks (.28x600,000).

I must admit, I have always seen the 40% of abortions are black statistic though.

https://www.mdch.state.mi.us/osr/abortion/Tab_US.asp (abortion data)

Sorry I lost the source on the % of abortions by race. It is hard to find good data on this, because most women, as much as feminists try to change this with that stupid "shout your abortion" campaign, are ashamed of killing their offspring. Surveys are useless, and Planned Parenthood isn't giving out its proprietary statistics on who utilizes their services.