The OECD have published data on homelessness in 29 member countries, including information on the total number of homeless people in the country, the proportion of the population that is classed as homeless and the year that the data is taken from. Although the data are useful for comparing the data collection methods used in each country, as explained in the report, the data themselves are not easily comparable due to different counting methods, meaning that the figures should not be taken as a "league table" of homelessness. Nevertheless, the work includes a useful breakdown of homelessness trends in selected OECD countries. See the report here.