The TTDI covers 117 countries. Economies that were covered in the TTCI 2019 but are not covered in the TTDI 2021 are Algeria, Brunei Darussalam, Burkina Faso, Burundi, Democratic Republic of the Congo, Ethiopia, Eswatini, Gambia, Guinea, Haiti, Iran, Jamaica, Liberia, Mauritania, Mozambique, Norway, Oman, Russian Federation, Seychelles, Uganda, Ukraine, Zimbabwe and Taiwan, China.