What is the highest year having a ten-year percentage change of 7.9?
CREATE TABLE "demography" (
  "year" real,
  "population" real,
  "five_year_pct_change" text,
  "ten_year_pct_change" text,
  "rank_among_provinces" real
);
SELECT MAX("year") FROM "demography" WHERE "ten_year_pct_change"='7.9';