-74.28% is the change from 521 to 134
Calculation steps:
[( 134 - 521 ) ÷ 521] x 100 = -74.28%
Formula
Percentage change = [(134 - 521) / 521] x 100
Subtract the new number by the original number
134 - 521 = -387
-387 ÷ 521 = -0.7428023032629558
-0.7428023032629558 x 100 = -74.28%