-51.12% is the change from 667 to 326
Calculation steps:
[( 326 - 667 ) ÷ 667] x 100 = -51.12%
Formula
Percentage change = [(326 - 667) / 667] x 100
Subtract the new number by the original number
326 - 667 = -341
-341 ÷ 667 = -0.5112443778110944
-0.5112443778110944 x 100 = -51.12%