What is the list of less economically developed countries?

In Africa these countries include: Angola, Benin, Burkina Faso, Burundi, Cape Verde Islands, Central African Republic, Chad, Comores, Democratic Republic of the Congo, Djibouti, Equatorial Guinea, Eritrea, Ethiopia, Lesotho, Mali, Rwanda, Somalia, Uganda, Gambia, Liberia, Mauritania, Sao Tome & Principe, Sudan, Zambia, Guinea, Madagascar, Mozambique, Senegal and Tanzania. In Asia it includes Afghanistan, Lao, Timor-Leste, Bangladesh, Maldives, Yemen, Bhutan, Myanmar, Cambodia and Nepal. In Australia and the Pacific it includes Kiribati, Samoa, Vanuatu, Solomon Islands and Tuvalu. And in the Caribbean it includes Haiti.