Derivation
INCTOT is a 7-digit numeric variable.
9999998 = Unknown/missing.
9999999 = NIU (not in universe).
Brazil 1991: 9,999,997+
Canada 1971: 50,000+ females in Atlantic region; 75,000+ for others
Canada 1981: 75,000+ all females, males in Atlantic region; 100,000+ males other regions
Canada 1991-2001: 200,000+
Dominican Republic 1981: 3,000+
Dominican Republic 2002: 500,000+
Indonesia 1976: 600,000+
Mexico 1970: 5,500,000+
Panama 2010: 10,000+
Puerto Rico 1980: 50,000+
South Africa 1996: 360,001+
South Africa 2001-2011: 2,457,601+
U.S.A. 1960: 25,000+
U.S.A. 1970: 50,000+
U.S.A. 1980: 75,000+
U.S.A. 1990: State median of values over 400,000
U.S.A. 2000: 999,998+
Canada 1981-2001: -50,000
U.S.A. 1960: -9,900
U.S.A. 1970: -9,900
U.S.A. 1980: -9,995
U.S.A. 1990, 2005: -19,998
U.S.A. 2000: -20,000
U.S.A. 2010: -15,870