-12.9% is the change from 915 to 797
Calculation steps:
[( 797 - 915 ) ÷ 915] x 100 = -12.9%
Formula
Percentage change = [(797 - 915) / 915] x 100
Subtract the new number by the original number
797 - 915 = -118
-118 ÷ 915 = -0.12896174863387977
-0.12896174863387977 x 100 = -12.9%