-86.26% is the change from 939 to 129
Calculation steps:
[( 129 - 939 ) ÷ 939] x 100 = -86.26%
Formula
Percentage change = [(129 - 939) / 939] x 100
Subtract the new number by the original number
129 - 939 = -810
-810 ÷ 939 = -0.8626198083067093
-0.8626198083067093 x 100 = -86.26%