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[1.7 Big Update!] Historically Accurate Randomize Farming Yields

HARF - Historically Accurate Randomized Farming. Have you ever wondered where all the good and bad harvests have gone? Do you want to randomly get famines and bountiful harvests? Do you want to reject the safety of steady time averaged yields? Then this is the mod for you!

SAVE GAME COMPATIBLE, compatible with most mods (even total overhauls!), all languages, and causes no noticeable lag, can be removed without ruining a save, not ironman compatible.

As of 25 June 2024 mod is now updated to apply randomized yields across entire strategic regions representing large scale climate conditions with reasonable accuracy as well as local effects. Credit to Gracchus for figuring out strategic regions. Check out his mod HMPS which also applies a similar randomized effect to mines. Because the same code is used in both you should only launch HMPS and disable this mod.

Every year, each state gets a randomized modifier to agricultural throughput. I went though great lengths to ensure that the randomness isn't arbitrary and matches historical data. The mod mostly just runs in the background updating the modifiers once a year. To my surprise this doesn't actually cause any noticeable lag at all, a single battle seems to take up more calculations than this mod does in a year.

The data used is very accurate to European and Northern American climates in 1800-1936. Yield per acre was largely constant in this whole period for all places only starting to increase with scientific farming in the 1930-40. The variation does seem roughly constant over the entire period of Victoria 3. Known issues are that while this mod currently works very well for modeling temperate climates; tropical, arid, tundra, and subtropical climates have completely different patterns. Keen eyed players will notice livestock ranches are excluded from the year-to-year variation. Future updates are in the work for correcting the values based on local climates. This is on purpose because data shows that herding has little year-to-year variation.

• Saving and restarting the game may cause some states to get multiple throughput bonuses. This will be temporary and go away in 1 year.
  
• Fixed! The variation mostly washes itself out except for small countries. An upcoming fix is to make states in the same strategic region have similar values.

• In the mod right now! Strategic regions will have closely correlated values. So for example instead of Alabama, Georgia, and Florida having independent throughput values, each will have a local component and a shared component for the Dixie strategic region.
  
• Better accuracy for non-temperate climates. The method being worked on will avoid hard-coding values so that the mod can work with any changes in the map or fantasy maps.
  Changes to make the variation slightly decrease over time as countries get better technology. These changes will be more applicable to mods running outside of Victoria 3's normal time window.