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

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'