Annual flow from internal BEA data. Annual flow is converted to seasonally adjusted quarterly flows by calculating the ratio of the annual number to NIPA, Table 5.1. Saving and Investment, line 36, Disaster losses, Domestic business (annual); multiplied by line 36, Disaster losses, Domestic business (quarterly). Unadjusted flow is the seasonally adjusted flow at an annual rate divided by 4. Series has no levels.