-2.69% is the change from 521 to 507
Calculation steps:
[( 507 - 521 ) ÷ 521] x 100 = -2.69%
Formula
Percentage change = [(507 - 521) / 521] x 100
Subtract the new number by the original number
507 - 521 = -14
-14 ÷ 521 = -0.026871401151631478
-0.026871401151631478 x 100 = -2.69%