-86.76% is the change from 521 to 69
Calculation steps:
[( 69 - 521 ) ÷ 521] x 100 = -86.76%
Formula
Percentage change = [(69 - 521) / 521] x 100
Subtract the new number by the original number
69 - 521 = -452
-452 ÷ 521 = -0.8675623800383877
-0.8675623800383877 x 100 = -86.76%