-74.86% is the change from 521 to 131
Calculation steps:
[( 131 - 521 ) ÷ 521] x 100 = -74.86%
Formula
Percentage change = [(131 - 521) / 521] x 100
Subtract the new number by the original number
131 - 521 = -390
-390 ÷ 521 = -0.7485604606525912
-0.7485604606525912 x 100 = -74.86%