-23.49% is the change from 681 to 521
Calculation steps:
[( 521 - 681 ) ÷ 681] x 100 = -23.49%
Formula
Percentage change = [(521 - 681) / 681] x 100
Subtract the new number by the original number
521 - 681 = -160
-160 ÷ 681 = -0.23494860499265785
-0.23494860499265785 x 100 = -23.49%