-93.67% is the change from 521 to 33
Calculation steps:
[( 33 - 521 ) ÷ 521] x 100 = -93.67%
Formula
Percentage change = [(33 - 521) / 521] x 100
Subtract the new number by the original number
33 - 521 = -488
-488 ÷ 521 = -0.9366602687140115
-0.9366602687140115 x 100 = -93.67%