-40.36% is the change from 664 to 396
Calculation steps:
[( 396 - 664 ) ÷ 664] x 100 = -40.36%
Formula
Percentage change = [(396 - 664) / 664] x 100
Subtract the new number by the original number
396 - 664 = -268
-268 ÷ 664 = -0.4036144578313253
-0.4036144578313253 x 100 = -40.36%