dʒˌiːˌɛmpˈiː ɪz kˈælkjʊlˌeɪɾᵻd ˈænjuːəli baɪ ðə bjˈʊɹɹoʊ ʌv ˌiːkənˈɑːmɪk ɐnˈæləsˌɪs wɪðˌɪn ðə juːnˈaɪɾᵻd stˈeɪts dᵻpˈɑːɹtmənt ʌv kˈɑːmɜːs.
GMP is calculated annually by the Bureau of Economic Analysis within the United States Department of Commerce.