-80.23% is the change from 521 to 103
Calculation steps:
[( 103 - 521 ) ÷ 521] x 100 = -80.23%
Formula
Percentage change = [(103 - 521) / 521] x 100
Subtract the new number by the original number
103 - 521 = -418
-418 ÷ 521 = -0.8023032629558541
-0.8023032629558541 x 100 = -80.23%