What is the largest crude birth rate when natural change is 215 at a rate greater than 7.2?
CREATE TABLE "vital_statistics" (
  "average_population" text,
  "live_births" real,
  "deaths" real,
  "natural_change" real,
  "crude_birth_rate_per_1000" real,
  "crude_death_rate_per_1000" real,
  "natural_change_per_1000" real
);
SELECT MAX("crude_birth_rate_per_1000") FROM "vital_statistics" WHERE "natural_change"=215 AND "natural_change_per_1000">7.2;