-49.24% is the change from 991 to 503
Calculation steps:
[( 503 - 991 ) ÷ 991] x 100 = -49.24%
Formula
Percentage change = [(503 - 991) / 991] x 100
Subtract the new number by the original number
503 - 991 = -488
-488 ÷ 991 = -0.4924318869828456
-0.4924318869828456 x 100 = -49.24%