What is the sort value that had deaths of 71?
CREATE TABLE "puerperal_fever_mortality_rates_for_birt" (
  "month" text,
  "births" text,
  "deaths" text,
  "rate_pct" text,
  "sort_restore" real
);
SELECT "sort_restore" FROM "puerperal_fever_mortality_rates_for_birt" WHERE "deaths"='71';