-22.26% is the change from 521 to 405
Calculation steps:
[( 405 - 521 ) ÷ 521] x 100 = -22.26%
Formula
Percentage change = [(405 - 521) / 521] x 100
Subtract the new number by the original number
405 - 521 = -116
-116 ÷ 521 = -0.22264875239923224
-0.22264875239923224 x 100 = -22.26%