-52.5% is the change from 680 to 323
Calculation steps:
[( 323 - 680 ) ÷ 680] x 100 = -52.5%
Formula
Percentage change = [(323 - 680) / 680] x 100
Subtract the new number by the original number
323 - 680 = -357
-357 ÷ 680 = -0.525
-0.525 x 100 = -52.5%