-80.9% is the change from 665 to 127
Calculation steps:
[( 127 - 665 ) ÷ 665] x 100 = -80.9%
Formula
Percentage change = [(127 - 665) / 665] x 100
Subtract the new number by the original number
127 - 665 = -538
-538 ÷ 665 = -0.8090225563909774
-0.8090225563909774 x 100 = -80.9%