-66.92% is the change from 390 to 129
Calculation steps:
[( 129 - 390 ) ÷ 390] x 100 = -66.92%
Formula
Percentage change = [(129 - 390) / 390] x 100
Subtract the new number by the original number
129 - 390 = -261
-261 ÷ 390 = -0.6692307692307692
-0.6692307692307692 x 100 = -66.92%