-80.12% is the change from 644 to 128
Calculation steps:
[( 128 - 644 ) ÷ 644] x 100 = -80.12%
Formula
Percentage change = [(128 - 644) / 644] x 100
Subtract the new number by the original number
128 - 644 = -516
-516 ÷ 644 = -0.8012422360248447
-0.8012422360248447 x 100 = -80.12%