-81.86% is the change from 215 to 39
Calculation steps:
[( 39 - 215 ) ÷ 215] x 100 = -81.86%
Formula
Percentage change = [(39 - 215) / 215] x 100
Subtract the new number by the original number
39 - 215 = -176
-176 ÷ 215 = -0.8186046511627907
-0.8186046511627907 x 100 = -81.86%