-81.17% is the change from 685 to 129
Calculation steps:
[( 129 - 685 ) ÷ 685] x 100 = -81.17%
Formula
Percentage change = [(129 - 685) / 685] x 100
Subtract the new number by the original number
129 - 685 = -556
-556 ÷ 685 = -0.8116788321167884
-0.8116788321167884 x 100 = -81.17%