-93.06% is the change from 216 to 15
Calculation steps:
[( 15 - 216 ) ÷ 216] x 100 = -93.06%
Formula
Percentage change = [(15 - 216) / 216] x 100
Subtract the new number by the original number
15 - 216 = -201
-201 ÷ 216 = -0.9305555555555556
-0.9305555555555556 x 100 = -93.06%