-81.6% is the change from 212 to 39
Calculation steps:
[( 39 - 212 ) ÷ 212] x 100 = -81.6%
Formula
Percentage change = [(39 - 212) / 212] x 100
Subtract the new number by the original number
39 - 212 = -173
-173 ÷ 212 = -0.8160377358490566
-0.8160377358490566 x 100 = -81.6%