-49.62% is the change from 657 to 331
Calculation steps:
[( 331 - 657 ) ÷ 657] x 100 = -49.62%
Formula
Percentage change = [(331 - 657) / 657] x 100
Subtract the new number by the original number
331 - 657 = -326
-326 ÷ 657 = -0.4961948249619482
-0.4961948249619482 x 100 = -49.62%