What is the number of sort values associated with 389 births?
CREATE TABLE "puerperal_fever_mortality_rates_for_birt" (
  "month" text,
  "births" text,
  "deaths" text,
  "rate_pct" text,
  "sort_restore" real
);
SELECT COUNT("sort_restore") FROM "puerperal_fever_mortality_rates_for_birt" WHERE "births"='389';