-73.32% is the change from 521 to 139
Calculation steps:
[( 139 - 521 ) ÷ 521] x 100 = -73.32%
Formula
Percentage change = [(139 - 521) / 521] x 100
Subtract the new number by the original number
139 - 521 = -382
-382 ÷ 521 = -0.7332053742802304
-0.7332053742802304 x 100 = -73.32%