From the Technical Summary, we have "When countries are assigned to income groups in this Technical Summary, the World Bank income classification for 2013 is used. For details see Annex A.II.3.", and the Annex says:
Upper Middle Income (UMC): Albania, Algeria, American Samoa, Angola, Argentina, Azerbaijan,
Belarus, Belize, Bosnia and Herzegovina, Botswana, Brazil, Bulgaria, China, Colombia, Cook Islands,
Costa Rica, Cuba, Dominica, Dominican Republic, Ecuador, Fiji, Gabon, Grenada, Hungary, Iran, Iraq,
Jamaica, Jordan, Kazakhstan, Lebanon, Libya, Macedonia, Malaysia, Maldives, Marshall Islands,
Mauritius, Mexico, Montenegro, Namibia, Niue, Palau, Panama, Peru, Romania, Saint Lucia, Saint
Vincent and the Grenadines, Serbia, Serbia and Montenegro, Seychelles, South Africa, Suriname,
Thailand, Tonga, Tunisia, Turkey, Turkmenistan, Tuvalu, Venezuela
Each year on July 1, The World Bank revises the classification of the world’s economies based on estimates of gross national income (GNI) per capita for the previous year. The updated GNI per capita estimates are also used as input to the Bank’s operational classification of economies, which determines their lending eligibility. As of 1 July 2013, the World Bank income classifications by GNI per capita are as follows:
Low income: $1,035 or less
Lower middle income: $1,036 to $4,085
Upper middle income: $4,086 to $12,615
High income: $12,616 or more
http://data.worldbank.org/news/new-country-classificationsApparently, the figures that Saudi Arabia didn't want in the SPM were (p. 144 of the Technical Summary):
Low income countries: 1990 3.5 Gt CO2 equiv, 2010 3.4 Gt
Lower middle: 1990 5.6 Gt, 2010 7.9 Gt
Upper middle: 1990 9.8 Gt, 18.3 Gt
High: 1990 18.3 Gt, 2010 18.7 Gt
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