-50.57% is the change from 261 to 129
Calculation steps:
[( 129 - 261 ) ÷ 261] x 100 = -50.57%
Formula
Percentage change = [(129 - 261) / 261] x 100
Subtract the new number by the original number
129 - 261 = -132
-132 ÷ 261 = -0.5057471264367817
-0.5057471264367817 x 100 = -50.57%