Government data are based on the National House Register in which heads of households register the members of the household with the local District Office. At birth, persons declare their religious affiliation in this manner. A national census is taken of this data every 10 years. As of 2000, the latest census data currently available, 486,840 people were registered as affiliates of Christian denominations or under 1% (0.7%) of total population (60 million). Comparisons of this data to determine whether Christians in Thailand are predominantly a certain gender, age or are from urban/rural areas does not show any remarkable variation from the near 1% figure, although the age group of 10-14 shows the highest (1.0%) ratio of Christians to national population. There may be limitations to this approach to verifying religious affiliation, such as inconsistent reporting, the change of religion to Christianity of young people under their parent's house register, reversion of young people to Buddhism and local administrative bias towards Buddhism. However, no available evidence currently demonstrates these limitations. Religious denominations each report different sets of affiliation data. The next official census is scheduled for 2010.