-47.47% is the change from 990 to 520
Calculation steps:
[( 520 - 990 ) ÷ 990] x 100 = -47.47%
Formula
Percentage change = [(520 - 990) / 990] x 100
Subtract the new number by the original number
520 - 990 = -470
-470 ÷ 990 = -0.47474747474747475
-0.47474747474747475 x 100 = -47.47%