-38.2% is the change from 843 to 521
Calculation steps:
[( 521 - 843 ) ÷ 843] x 100 = -38.2%
Formula
Percentage change = [(521 - 843) / 843] x 100
Subtract the new number by the original number
521 - 843 = -322
-322 ÷ 843 = -0.3819691577698695
-0.3819691577698695 x 100 = -38.2%