-72.17% is the change from 521 to 145
Calculation steps:
[( 145 - 521 ) ÷ 521] x 100 = -72.17%
Formula
Percentage change = [(145 - 521) / 521] x 100
Subtract the new number by the original number
145 - 521 = -376
-376 ÷ 521 = -0.7216890595009597
-0.7216890595009597 x 100 = -72.17%