-80.25% is the change from 643 to 127
Calculation steps:
[( 127 - 643 ) ÷ 643] x 100 = -80.25%
Formula
Percentage change = [(127 - 643) / 643] x 100
Subtract the new number by the original number
127 - 643 = -516
-516 ÷ 643 = -0.80248833592535
-0.80248833592535 x 100 = -80.25%