-86.6% is the change from 291 to 39
Calculation steps:
[( 39 - 291 ) ÷ 291] x 100 = -86.6%
Formula
Percentage change = [(39 - 291) / 291] x 100
Subtract the new number by the original number
39 - 291 = -252
-252 ÷ 291 = -0.865979381443299
-0.865979381443299 x 100 = -86.6%