Fix average monthly income calculation #125
Merged
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The number of months for monthly average income calculation only takes into account the months where there is an actual income. So if there is a month with no income (for example last year), the 'monthly average' gets artificially bumped up.
This simplifies the calculation to use the actual number of months in the given year (current month number for the current year, 12 for previous years) rather than only the months where there was some income