-83.06% is the change from 921 to 156
Calculation steps:
[( 156 - 921 ) ÷ 921] x 100 = -83.06%
Formula
Percentage change = [(156 - 921) / 921] x 100
Subtract the new number by the original number
156 - 921 = -765
-765 ÷ 921 = -0.8306188925081434
-0.8306188925081434 x 100 = -83.06%