What is the least amount of freight carried when the super b capacity reached was February 26?
CREATE TABLE "statistics" (
  "year" real,
  "road_opened" text,
  "road_closed" text,
  "freight_carried_s_tonne" real,
  "super_b_capacity_reached_citation_needed" text,
  "number_of_truck_loads_north" real
);
SELECT MIN("freight_carried_s_tonne") FROM "statistics" WHERE "super_b_capacity_reached_citation_needed"='February 26';