-81.05% is the change from 665 to 126
Calculation steps:
[( 126 - 665 ) ÷ 665] x 100 = -81.05%
Formula
Percentage change = [(126 - 665) / 665] x 100
Subtract the new number by the original number
126 - 665 = -539
-539 ÷ 665 = -0.8105263157894737
-0.8105263157894737 x 100 = -81.05%