Name the year for points less than 20 and chassis of dallara 3087
CREATE TABLE "complete_international_formula_3000_resu" (
  "year" real,
  "chassis" text,
  "engine" text,
  "tyres" text,
  "points" real
);
SELECT "year" FROM "complete_international_formula_3000_resu" WHERE "points"<20 AND "chassis"='dallara 3087';