Name the average popular votes in years after 1990 with percentage of 4.94%
CREATE TABLE "results_in_minnesota_state_elections" (
  "year" real,
  "office" text,
  "candidate" text,
  "popular_votes" real,
  "percentage" text
);
SELECT AVG("popular_votes") FROM "results_in_minnesota_state_elections" WHERE "percentage"='4.94%' AND "year">1990;