-93.12% is the change from 218 to 15
Calculation steps:
[( 15 - 218 ) ÷ 218] x 100 = -93.12%
Formula
Percentage change = [(15 - 218) / 218] x 100
Subtract the new number by the original number
15 - 218 = -203
-203 ÷ 218 = -0.9311926605504587
-0.9311926605504587 x 100 = -93.12%