-49.33% is the change from 521 to 264
Calculation steps:
[( 264 - 521 ) ÷ 521] x 100 = -49.33%
Formula
Percentage change = [(264 - 521) / 521] x 100
Subtract the new number by the original number
264 - 521 = -257
-257 ÷ 521 = -0.4932821497120921
-0.4932821497120921 x 100 = -49.33%