-45.61% is the change from 991 to 539
Calculation steps:
[( 539 - 991 ) ÷ 991] x 100 = -45.61%
Formula
Percentage change = [(539 - 991) / 991] x 100
Subtract the new number by the original number
539 - 991 = -452
-452 ÷ 991 = -0.45610494450050454
-0.45610494450050454 x 100 = -45.61%