-87.51% is the change from 921 to 115
Calculation steps:
[( 115 - 921 ) ÷ 921] x 100 = -87.51%
Formula
Percentage change = [(115 - 921) / 921] x 100
Subtract the new number by the original number
115 - 921 = -806
-806 ÷ 921 = -0.8751357220412594
-0.8751357220412594 x 100 = -87.51%