-47.85% is the change from 999 to 521
Calculation steps:
[( 521 - 999 ) ÷ 999] x 100 = -47.85%
Formula
Percentage change = [(521 - 999) / 999] x 100
Subtract the new number by the original number
521 - 999 = -478
-478 ÷ 999 = -0.47847847847847846
-0.47847847847847846 x 100 = -47.85%