-84.84% is the change from 851 to 129
Calculation steps:
[( 129 - 851 ) ÷ 851] x 100 = -84.84%
Formula
Percentage change = [(129 - 851) / 851] x 100
Subtract the new number by the original number
129 - 851 = -722
-722 ÷ 851 = -0.8484136310223267
-0.8484136310223267 x 100 = -84.84%