There is no way someone else will read your code and modify/help you. I think you would be the best one to understand the intuition and the relation between monthly and annual figures. For example, some annual ratio/numbers are best the sum of all month in that year (such as SALE, profit) while some should be the average of the months (e.g. current assets, or cash). Once you figure that out, computing the annual figures is not difficult.
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