What are the slovenian names of the villages that had 16.7% of slovenes in 1991?
CREATE TABLE "references" (
  "village_german" text,
  "village_slovenian" text,
  "number_of_people_1991" real,
  "percent_of_slovenes_1991" text,
  "percent_of_slovenes_1951" text
);
SELECT "village_slovenian" FROM "references" WHERE "percent_of_slovenes_1991"='16.7%';