CREATE TABLE table_204_676 (id DECIMAL, "year" DECIMAL, "division" DECIMAL, "league" TEXT, "regular season" TEXT, "playoffs" TEXT, "open cup" TEXT)

the richmond kickers future made the national semifinals only once . what year was it ?
SELECT "year" FROM table_204_676 WHERE "playoffs" = 'national semifinals'
SELECT "year" FROM "table_204_676" WHERE "playoffs" = 'national semifinals'