86.63% is the change from 531 to 991
Calculation steps:
[( 991 - 531 ) ÷ 531] x 100 = 86.63%
Formula
Percentage change = [(991 - 531) / 531] x 100
Subtract the new number by the original number
991 - 531 = 460
460 ÷ 531 = 0.8662900188323918
0.8662900188323918 x 100 = 86.63%