-83.71% is the change from 921 to 150
Calculation steps:
[( 150 - 921 ) ÷ 921] x 100 = -83.71%
Formula
Percentage change = [(150 - 921) / 921] x 100
Subtract the new number by the original number
150 - 921 = -771
-771 ÷ 921 = -0.8371335504885994
-0.8371335504885994 x 100 = -83.71%