Chart 1: Comparison groups. To create comparisons across countries and regions, the report uses the World Bank’s 2020/21 classification of economies into low-income, lower-middle-income, upper-middle-income and high-income groups.[4 World Bank, New World Bank classifications by income level: 2020–2021, 1 July 2020] With the exception of Djibouti, which is lower-middle, the rest of the Horn ...