pop: Population
Variable
Population sector
Population [Person]
pop = p1 + p2 + p3 + p4

pop in the updating graph: ( how to read )
In nodes
p1 : Population 0 To 14
p2 : Population 15 To 44
p3 : Population 45 To 64
p4 : Population 65 Plus
Out nodes
cbr : birth rate
cdr : death rate
ciopc : consumed industrial output per capita
fpc : food per capita
fpu : fraction of population urban
iopc : industrial output per capita
nrur : resource usage rate
ppgio : persistent pollution generation industry
sopc : service output per capita
uilr : urban and industrial land required