-93.98% is the change from 664 to 40
Calculation steps:
[( 40 - 664 ) ÷ 664] x 100 = -93.98%
Formula
Percentage change = [(40 - 664) / 664] x 100
Subtract the new number by the original number
40 - 664 = -624
-624 ÷ 664 = -0.9397590361445783
-0.9397590361445783 x 100 = -93.98%