-50.3% is the change from 656 to 326
Calculation steps:
[( 326 - 656 ) ÷ 656] x 100 = -50.3%
Formula
Percentage change = [(326 - 656) / 656] x 100
Subtract the new number by the original number
326 - 656 = -330
-330 ÷ 656 = -0.5030487804878049
-0.5030487804878049 x 100 = -50.3%