-47.37% is the change from 990 to 521
Calculation steps:
[( 521 - 990 ) ÷ 990] x 100 = -47.37%
Formula
Percentage change = [(521 - 990) / 990] x 100
Subtract the new number by the original number
521 - 990 = -469
-469 ÷ 990 = -0.47373737373737373
-0.47373737373737373 x 100 = -47.37%