Annual unadjusted flow from BEA, NIPA. Series is calculated as the sum of Table 1.12, line 9, Proprietors' income with IVA and CCAdj and Table 7.9, line 2, Rental income of persons with CCAdj 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.