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
);

Question: What is the smallest amount of freight carried on the road that closed on March 31 and reached super B capacity on February 17 after 2011?
SQL: SELECT MIN("freight_carried_s_tonne") FROM "statistics" WHERE "road_closed"='march 31' AND "super_b_capacity_reached_citation_needed"='february 17' AND "year">2011;