-50.38% is the change from 657 to 326
Calculation steps:
[( 326 - 657 ) ÷ 657] x 100 = -50.38%
Formula
Percentage change = [(326 - 657) / 657] x 100
Subtract the new number by the original number
326 - 657 = -331
-331 ÷ 657 = -0.5038051750380518
-0.5038051750380518 x 100 = -50.38%