CREATE TABLE table_15187 ("Year" FLOAT, "Population  ( Total ) " FLOAT, " ( Barcaldine ) " FLOAT, " ( Aramac ) " FLOAT, " ( Jericho ) " FLOAT)

What year had a Poulation (Total) of 3,492 and a (Barcaldine) less than 1,818?
SELECT AVG("Year") FROM table_15187 WHERE "Population (Total)" = '3,492' AND "(Barcaldine)" < '1,818'
SELECT AVG("Year") FROM "table_15187" WHERE "(Barcaldine)" < '1,818' AND "Population (Total)" = '3,492'