-49.78% is the change from 685 to 344
Calculation steps:
[( 344 - 685 ) ÷ 685] x 100 = -49.78%
Formula
Percentage change = [(344 - 685) / 685] x 100
Subtract the new number by the original number
344 - 685 = -341
-341 ÷ 685 = -0.4978102189781022
-0.4978102189781022 x 100 = -49.78%