what is the nation when the height (m) is 1.91 and the weight (kg) is 99?
CREATE TABLE "sortable_list_of_competitors_with_s_kipp" (
  "nation" text,
  "birth_date" text,
  "height_m" text,
  "weight_kg" text,
  "world_rank" text
);
SELECT "nation" FROM "sortable_list_of_competitors_with_s_kipp" WHERE "height_m"='1.91' AND "weight_kg"='99';