Male population as of 1st January of the year indicated. It is based on concept of usual resident population, i.e. the number of inhabitants of a given area on 1 January of the year in question (or, in some cases, on 31 December of the previous year). The population figures can be based on data from the most recent census adjusted by the components of population change produced since the last census, or based on population registers. Usually resident population means all persons having usual residence in a country at the reference time. Usual residence means the place where a person normally spends the daily period of rest, regardless of temporary absences for purposes of recreation, holidays, visits to friends and relatives, business, medical treatment or religious pilgrimage. The following persons alone are considered to be usual residents of the geographical area in question: a) those who have lived in their place of usual residence for a continuous period of at least 12 months before the reference time; or b) those who arrived in their place of usual residence during the 12 months before the reference time with the intention of staying there for at least one year.