What is the average insurance annuities in the United States?

"In the U.S. an annuity contract is created when an insured party, usually an individual, pays a life insurance company a single premium that will later be distributed back to the insured party over time. Annuity contracts traditionally provide a guaranteed distribution of income over time, until the death of the person or persons named in the contract or until a final date, whichever comes first"