The SFB has calculated ADM yield factors for every school district in Arizona based on Censuses 2000 and 2010. For school districts in Maricopa County and Pinal County, the SFB has also developed a time series of ADM yield factors during 2001-2018 and 2012-2018, respectively. ADM yield factors for school districts in Pima County have been added for 2018. Such data is not available for school districts in other counties due to lack of housing completion data. It should be noted that a district's ADM yield factor can change considerably over time depending on the changing demographics of the district.