More than 17,500 value changes were made in Volume 6 of the 2010 Scott Catalogue. Almost every country in Volume 6, which includes countries of the world So-Z, shows some value changes. Countries with the largest number of value changes include Uruguay with 2,828 changes, Tunisia (1,380), Tuvalu (1,084), Tonga (1,020), Spain (977), Sweden (951), Surinam (926), Zaire (815), North Vietnam (653, with another 113 for South Vietnam) and South Africa (500