What is the average year that the medical school in dominican republic was established?
CREATE TABLE "current_medical_schools_in_the_caribbean" (
  "country_territory" text,
  "established" real,
  "degree" text,
  "regional_offshore" text,
  "imed_avicenna_listed" text
);
SELECT AVG("established") FROM "current_medical_schools_in_the_caribbean" WHERE "country_territory"='dominican republic';