-85.8% is the change from 521 to 74
Calculation steps:
[( 74 - 521 ) ÷ 521] x 100 = -85.8%
Formula
Percentage change = [(74 - 521) / 521] x 100
Subtract the new number by the original number
74 - 521 = -447
-447 ÷ 521 = -0.8579654510556622
-0.8579654510556622 x 100 = -85.8%