-79.88% is the change from 641 to 129
Calculation steps:
[( 129 - 641 ) ÷ 641] x 100 = -79.88%
Formula
Percentage change = [(129 - 641) / 641] x 100
Subtract the new number by the original number
129 - 641 = -512
-512 ÷ 641 = -0.7987519500780031
-0.7987519500780031 x 100 = -79.88%