 There were no contemporary censuses of London's population, but available records suggest that the population returned to its previous level within a couple of years.Burials in 1667 had returned to 1663 levels, Hearth Tax returns had recovered, and John Graunt contemporarily analysed baptism records and concluded they represented a recovered population.Part of this could be accounted for by the return of wealthy households, merchants and manufacturing industries, all of which needed to replace losses among their staff and took steps to bring in necessary people.