-16.31% is the change from 521 to 436
Calculation steps:
[( 436 - 521 ) ÷ 521] x 100 = -16.31%
Formula
Percentage change = [(436 - 521) / 521] x 100
Subtract the new number by the original number
436 - 521 = -85
-85 ÷ 521 = -0.16314779270633398
-0.16314779270633398 x 100 = -16.31%