When the population rank is 34, what the is % change?
CREATE TABLE "references" (
  "name" text,
  "2011_census" real,
  "2006_census" real,
  "pct_change" text,
  "land_area_km" text,
  "density_pop_km" text,
  "population_rank" real
);
SELECT "pct_change" FROM "references" WHERE "population_rank"=34;