-90.82% is the change from 915 to 84
Calculation steps:
[( 84 - 915 ) ÷ 915] x 100 = -90.82%
Formula
Percentage change = [(84 - 915) / 915] x 100
Subtract the new number by the original number
84 - 915 = -831
-831 ÷ 915 = -0.9081967213114754
-0.9081967213114754 x 100 = -90.82%