Seasonally adjusted flow from BEA, NIPA, Table 1.7.5, line 2, Income receipts from the rest of the world. Prior to 2007, unadjusted flow from BEA, NIPA, Table 8.5, line 5, Interest receipts. Seasonal factors are calculated as the seasonally adjusted flow at an annual rate, divided by four, less the unadjusted quarterly flow. Beginning in 2007, unadjusted flow is equal to the seasonally adjusted flow divided by four and seasonal factors are zero. Series has no levels.