-89.71% is the change from 204 to 21
Calculation steps:
[( 21 - 204 ) ÷ 204] x 100 = -89.71%
Formula
Percentage change = [(21 - 204) / 204] x 100
Subtract the new number by the original number
21 - 204 = -183
-183 ÷ 204 = -0.8970588235294118
-0.8970588235294118 x 100 = -89.71%