What is the change in population since 1993 in the region where the % of country's population was 4.2? 
CREATE TABLE "results" (
  "region" text,
  "population" real,
  "pct_of_countrys_population" text,
  "change_in_population_since_1993" real,
  "change_in_pct_of_countrys_population_since_1993" text
);
SELECT COUNT("change_in_population_since_1993") FROM "results" WHERE "pct_of_countrys_population"='4.2';