Seasonally adjusted flow from BEA, NIPA, Table 1.5.5, line 2, Personal consumption expenditures. Prior to 2007, unadjusted flow from BEA, NIPA, Table 8.1, line 2, Personal consumption expenditures. Seasonal factors are calculated as the seasonally adjusted flow at an annual rate, divided by four, less the unadjusted quarterly flow. Series has no levels.