-47.63% is the change from 991 to 519
Calculation steps:
[( 519 - 991 ) ÷ 991] x 100 = -47.63%
Formula
Percentage change = [(519 - 991) / 991] x 100
Subtract the new number by the original number
519 - 991 = -472
-472 ÷ 991 = -0.47628657921291623
-0.47628657921291623 x 100 = -47.63%