-38.41% is the change from 643 to 396
Calculation steps:
[( 396 - 643 ) ÷ 643] x 100 = -38.41%
Formula
Percentage change = [(396 - 643) / 643] x 100
Subtract the new number by the original number
396 - 643 = -247
-247 ÷ 643 = -0.38413685847589424
-0.38413685847589424 x 100 = -38.41%