... after the Oscars made overdue history by awarding best actor to Denzel Washington and best actress to Halle Berry, the first time black actors won both top performing honours in the same year. It’s a feat that hasn’t been repeated since.

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Blacks make up 13% of the population of the U.S. When you consider that a good proportion of the actors nominated come from the UK, France, Canada, and other countries with a smaller black population than the U.S., a 1 in 10 ratio is probably closer to representative of the overall actor pool. That means in any given year, if blacks were represented in leading screen roles proportional to their share of the overall population nominations are drawn from, we should expect 1. of the 10 best actor nominations  to go to a black actor - or one every two years for each of the lead acting categories. So statistically, both a black actor and actress winning the Oscar  in the same year should be extraordinarily rare.