Annual unadjusted flow from BEA, NIPA. Series calculated as Table 1.12, line 9, Proprietors' income with IVA and CCAdj plus Table 7.9, line 2, Rental income of persons with capital consumption adjustment: Other private business. Series is converted to quarterly by dividing the annual unadjusted flow by 4 and applying it to each four quarters. Data for the most recent ten years show no significant seasonality. Series has no levels.