-91.94% is the change from 670 to 54
Calculation steps:
[( 54 - 670 ) ÷ 670] x 100 = -91.94%
Formula
Percentage change = [(54 - 670) / 670] x 100
Subtract the new number by the original number
54 - 670 = -616
-616 ÷ 670 = -0.9194029850746268
-0.9194029850746268 x 100 = -91.94%