-23.94% is the change from 685 to 521
Calculation steps:
[( 521 - 685 ) ÷ 685] x 100 = -23.94%
Formula
Percentage change = [(521 - 685) / 685] x 100
Subtract the new number by the original number
521 - 685 = -164
-164 ÷ 685 = -0.23941605839416058
-0.23941605839416058 x 100 = -23.94%