CREATE TABLE table_204_863 (id NUMBER, "state" CLOB, "city/county" CLOB, "population served" NUMBER, "charter type" CLOB, "station name" CLOB, "web site" CLOB)

what is the number of people served by the rolla station ?
SELECT "population served" FROM table_204_863 WHERE "city/county" = 'rolla'
SELECT "population served" FROM "table_204_863" WHERE "city/county" = 'rolla'