-53.14% is the change from 685 to 321
Calculation steps:
[( 321 - 685 ) ÷ 685] x 100 = -53.14%
Formula
Percentage change = [(321 - 685) / 685] x 100
Subtract the new number by the original number
321 - 685 = -364
-364 ÷ 685 = -0.5313868613138686
-0.5313868613138686 x 100 = -53.14%