# Negative percent change

Hello

Does anyone have ideas for problem of calculation of my analysis?

year 2013 year change in % 2012

sales 12 580 000-16 289 570 - 177

This is clearly not good variation in %.

Now, my formula is: (year2013-year2012) / year2012

He works very well with positive numbers and negative numbers cause problems. How should I change this formula, but I need to retain the ability to calculate numbers?

Something like that...

(year2013-year2012) set (year2012)

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