What were the investment earnings in the year that State and Federal taxes were $13,999,169?
CREATE TABLE "district_122_gross_revenue_by_sources" (
  "year" real,
  "property_taxes" text,
  "investment_earnings" text,
  "other_local_sources" text,
  "state_federal" text,
  "total_revenue" text
);
SELECT "investment_earnings" FROM "district_122_gross_revenue_by_sources" WHERE "state_federal"='13,999,169';