From the Overview: "This white paper presents two methodologies to derive a national estimate for the total number of fire incidents in the U.S. using the incident data submitted to the NFIRS [National Fire Incident Reporting System]. The 2010 validated fire incident data from the NFIRS was used as the basis. There were several reasons for this choice. First, at the time of the initial study in 2012, it was the most recent NFIRS fire incident data available. Second, in using the 2010 NFIRS data, there would be no lag between the population characteristics collected from the 2010 Census and the 2010 fire incidents as reported in the NFIRS. Lastly, demographic data at appropriate geographic levels was available for geographies in 2010. A subsequent application of the methodology to 2009 and 2011 NFIRS fire incident data was undertaken to assess the robustness of the methodology."
United States Fire Administration: https://www.usfa.fema.gov/