-95.97% is the change from 521 to 21
Calculation steps:
[( 21 - 521 ) ÷ 521] x 100 = -95.97%
Formula
Percentage change = [(21 - 521) / 521] x 100
Subtract the new number by the original number
21 - 521 = -500
-500 ÷ 521 = -0.9596928982725528
-0.9596928982725528 x 100 = -95.97%