-17.74% is the change from 998 to 821
Calculation steps:
[( 821 - 998 ) ÷ 998] x 100 = -17.74%
Formula
Percentage change = [(821 - 998) / 998] x 100
Subtract the new number by the original number
821 - 998 = -177
-177 ÷ 998 = -0.17735470941883769
-0.17735470941883769 x 100 = -17.74%