-90.14% is the change from 213 to 21
Calculation steps:
[( 21 - 213 ) ÷ 213] x 100 = -90.14%
Formula
Percentage change = [(21 - 213) / 213] x 100
Subtract the new number by the original number
21 - 213 = -192
-192 ÷ 213 = -0.9014084507042254
-0.9014084507042254 x 100 = -90.14%