New Year's Festival

Every year, if your population is bigger than 100 people, you have the option to hold a New Year's Festival. This festival is pretty important to your people. They will be happier if you hold it, and will become unhappier when you prohibit them to celebrate the new year.

A New Year's festival costs you money and food, how much of both depends on your population.

The formula:

cash: (population + 10) / 5
round down to the nearest multiple of 100
food: rounded cash x 2

Example: if you have a city of 4200:
cash: (4200 + 10) / 5 = 842, round down to 800
food: 800 * 2 = 1600

Below a table for populations up to 5490:

Zodiac Bonus

If you hold a festival when the year of your zodiac animal starts, you receive a bonus. You can choose which bonus you want to have: a gift, reduced building cost, improved yield/production, or a defensive military bonus. What you get depends on the element of that year: wood, fire, earth, metal or water.

Gift

You get a gift of one of the listed goods based on the element, plus you get an animal for your menagerie if you have built your palace.

Reduced building cost

When you build one of the structures listed for the element of that year, you only pay one quarter of the normal cost.

Improved Yield/Production

You get double productions from the buildings listed below associated with the element of that year.

Defensive Military Bonus

You get a military benefit on your map only for that year.