-47.53% is the change from 991 to 520
Calculation steps:
[( 520 - 991 ) ÷ 991] x 100 = -47.53%
Formula
Percentage change = [(520 - 991) / 991] x 100
Subtract the new number by the original number
520 - 991 = -471
-471 ÷ 991 = -0.47527749747729564
-0.47527749747729564 x 100 = -47.53%