Forecast for the remainder of the year 2022

[Creedless_Soul]

Country	2021	2022	Change%
Australia	160	294	83.75%
USA	1510	1357	-10.13%
France	2357	3567	51.34%
Italy	156	92	-41.03%

The 2021 Column contains the number of people registered on a website for each country and 2022 contains the same although 2022 is not a full year data, it is only until the 10th of September. How do I forecast value for the remainder of 2022 based on what it would look like at the end of December (i.e. 31st December, 2022)? 

[#2]

@Creedless_Soul Forecasting is all about assumptions. You could say that Australia increased by 134 during the fist 253 days of the year. If that growth trend continues you'll end up with 353 at the end of the year (160 + 134*365/253). In a formula, it would look like this:

file attached.

Alternatively, the 4th quarter may develop differently. Perhaps you can look back at what happened during the 4th quarter 2021 and use that as a basis to predict 2022. Or, if the growth in the past few weeks has been extreme that may continue (or not). Forecasting is not an exact science. It's all about assumptions :)

[#3]

Thank you @Riny_van_Eekelen! I just added some additional steps to the 'Forecast Value' as 3 of the countries above have a reduction when compared to the actual value.
Used =ABS function to get a diff. between the new value and actual value and then added the absolute value to the 2022, Sep 10 value.

More methods to forecast would be helpful if anyone would like to share. Would love to know what other approaches could be used in this scenario.