World Population Today: "The world population has grown tremendously over the past two thousand years. In 1999, the world population passed the six billion mark. Latest official current world population estimate, for mid-year 2013, is estimated at 7,095,217,980. The linked chart shows past world population data back to the year one and future world population projections through the year 2083." Image Source: http://efergy.com/blog/world-population-2013-what-do-we-now-know/
Agriculture town ~ est age btw, 6 to 21 yrs, require proper "social re-engineering" to ensure a consistent profiling/distribution of individuals by age group whom choose to migrate to the various towns.
World population estimates from 1800 to 2100, based on UN 2010 projections (red, orange, green) and US Census Bureau historical estimates (black). According to the highest estimate, the world population may rise to 16 billion by 2100; according to the lowest estimate, it may decline to only 6 billion.