South Africa’s first census in a decade shows wealth disparities between race groups that persist 18 years after the end of apartheid. While incomes for black households increased an average 169 percent over 10 years, their annual earnings are 60,613 rand ($6,987), or a sixth of that for whites, Statistics South Africa said in a report released in Cape Town. About 80 percent of South Africa’s 51.8 million population is black.