SELECT AVG("Crude death rate (per 1000)") FROM table_11431 WHERE "Live births" < '72,400' AND "Crude birth rate (per 1000)" > '10' AND "Average population (x 1000)" = '2,518'
what is the average crude death rate (per 1000) when the live births is less than 72,400, the crude birth rate (per 1000) is more than 10 and the average population (x1000) is 2,518?
CREATE TABLE table_11431 (
    "Average population (x 1000)" real,
    "Live births" real,
    "Deaths" text,
    "Natural change" real,
    "Crude birth rate (per 1000)" real,
    "Crude death rate (per 1000)" real,
    "Natural change (per 1000)" real
)