-82.83% is the change from 530 to 91
Calculation steps:
[( 91 - 530 ) ÷ 530] x 100 = -82.83%
Formula
Percentage change = [(91 - 530) / 530] x 100
Subtract the new number by the original number
91 - 530 = -439
-439 ÷ 530 = -0.8283018867924529
-0.8283018867924529 x 100 = -82.83%