-95.91% is the change from 513 to 21
Calculation steps:
[( 21 - 513 ) ÷ 513] x 100 = -95.91%
Formula
Percentage change = [(21 - 513) / 513] x 100
Subtract the new number by the original number
21 - 513 = -492
-492 ÷ 513 = -0.9590643274853801
-0.9590643274853801 x 100 = -95.91%