-38.77% is the change from 521 to 319
Calculation steps:
[( 319 - 521 ) ÷ 521] x 100 = -38.77%
Formula
Percentage change = [(319 - 521) / 521] x 100
Subtract the new number by the original number
319 - 521 = -202
-202 ÷ 521 = -0.3877159309021113
-0.3877159309021113 x 100 = -38.77%