-81.22% is the change from 921 to 173
Calculation steps:
[( 173 - 921 ) ÷ 921] x 100 = -81.22%
Formula
Percentage change = [(173 - 921) / 921] x 100
Subtract the new number by the original number
173 - 921 = -748
-748 ÷ 921 = -0.8121606948968513
-0.8121606948968513 x 100 = -81.22%