i think 1980 0r 1998 i hope i helped
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Demographic data include on one hand population staticsuch as population size, population spatial distribution, and population composition such as age, sex, ethnicity, and other decomposed socioeconomic components such as types of residence, marital status, educational status, health status, employment status, occupation, industry, etc. and population dynamicson another such as births, deaths, migration, marriage, divorce, income etc..Population static represents population numbers at a given time in a given area, which is meaningful at a point of time, rather than a duration of time; population dynamics represents numbers of an event such as births, deaths, and migration within a period of time, rather than a point of time. Static indices, or point indices, are not additive, while the dynamic indices, or period indices, are additive.
a long time
Depends on the date, year, time.
approximatly 787 million