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Population is a Township stat that counts the number of people in a Town. The maximum population is increased by building Basic Shelter.
Experience
Experience in Township earned per tick is given by the following formula:
[math]\displaystyle{ \text{Base Experience} = \max \left (\left ( 1 + \frac{\text{Happiness %}}{100} + \frac{\text{SkillXPBonus %}}{100} \right ) \times \frac{\text{Current Population}}{100} \times \frac{\text{Tick Length}}{10}, 1 \right ) }[/math]
Where [math]\displaystyle{ \text{Tick Length} = 300 }[/math], being the number of seconds taken to gain a tick.
Gaining Population
The chance of gaining additional population when advancing one tick is given by the following formula:
[math]\displaystyle{ \text{Population Gain Chance} = \min \left (1.4  \frac{\text{Current Population}}{\text{Population Limit}}, 1 \right ) }[/math]
Where 1 indicates a 100% chance of gaining population, and 0 indicates a 0% chance of gaining population
If the roll for gaining population succeeds, the amount of population gained is given by the following formula:
[math]\displaystyle{ \text{Population Gain Rate} = \min \left (\left \lceil \frac{\text{Population Limit}}{2000} \times \frac{\text{Tick Length}}{10} \right \rceil, \text{Population Limit}  \text{Current Population} \right ) }[/math]
90% of the population gain will be from migration, where the new person will have an age randomly distributed between 16 to 50, and 10% of the population gain will be from births, with an age of 0. Below 10 population, all population gain is from migration.
Aging
One year of age is equivalent to 8.7 ticks.