-25.91% is the change from 521 to 386
Calculation steps:
[( 386 - 521 ) ÷ 521] x 100 = -25.91%
Formula
Percentage change = [(386 - 521) / 521] x 100
Subtract the new number by the original number
386 - 521 = -135
-135 ÷ 521 = -0.2591170825335892
-0.2591170825335892 x 100 = -25.91%