-51.87% is the change from 991 to 477
Calculation steps:
[( 477 - 991 ) ÷ 991] x 100 = -51.87%
Formula
Percentage change = [(477 - 991) / 991] x 100
Subtract the new number by the original number
477 - 991 = -514
-514 ÷ 991 = -0.5186680121089808
-0.5186680121089808 x 100 = -51.87%