CREATE TABLE table_204_172 (id DECIMAL, "year" DECIMAL, "representative" TEXT, "hometown" TEXT, "placement in miss nepal" TEXT, "special awards at miss nepal" TEXT, "placement in miss pokhara" TEXT)

in what year did miss pokhara last win the miss nepal award ?
SELECT "year" FROM table_204_172 WHERE "placement in miss nepal" = 'winner' ORDER BY "year" DESC LIMIT 1
SELECT "year" FROM "table_204_172" WHERE "placement in miss nepal" = 'winner' ORDER BY "year" DESC NULLS LAST LIMIT 1