-51.76% is the change from 680 to 328
Calculation steps:
[( 328 - 680 ) ÷ 680] x 100 = -51.76%
Formula
Percentage change = [(328 - 680) / 680] x 100
Subtract the new number by the original number
328 - 680 = -352
-352 ÷ 680 = -0.5176470588235295
-0.5176470588235295 x 100 = -51.76%