-73.88% is the change from 823 to 215
Calculation steps:
[( 215 - 823 ) ÷ 823] x 100 = -73.88%
Formula
Percentage change = [(215 - 823) / 823] x 100
Subtract the new number by the original number
215 - 823 = -608
-608 ÷ 823 = -0.7387606318347509
-0.7387606318347509 x 100 = -73.88%