Derivation
INCEARN is an 8-digit numeric variable.
99999998 = Unknown/missing.
99999999 = NIU (not in universe).
Israel 1972: 16,000+
Canada 1971: 50,000+
Canada 1981: 75,000+
Canada 2001: 200,000+
Mexico 1990: 90,000,000+
Mexico 2000: 999,998+
Mexico 2010: 1,000,000+
Panama 2000: 9,997+
Puerto Rico 1990: 999,999+
Puerto Rico 2000: 310,000+
U.S.A. 1990: State median of values over 284,000
U.S.A. 2000: 310,000+
U.S.A. 2005: 9,999,999+
Venezuela 1971: 2000+
Canada 1981-2001: -50,000
Puerto Rico 1990-2010: -9,999
U.S.A. 1990: -19,996
U.S.A. 2000-2005: -9,999
U.S.A. 2010: -9,900