-45.71% is the change from 991 to 538
Calculation steps:
[( 538 - 991 ) ÷ 991] x 100 = -45.71%
Formula
Percentage change = [(538 - 991) / 991] x 100
Subtract the new number by the original number
538 - 991 = -453
-453 ÷ 991 = -0.4571140262361251
-0.4571140262361251 x 100 = -45.71%