Seasonally adjusted flow from BEA, NIPA, Table 1.5.5. Calculated as line 53, National defense, Gross investment; plus line 56, Nondefense, Gross investment. Unadjusted flow from BEA, NIPA, Table 3.22, line 25, Gross government investment. 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.