-17.84% is the change from 998 to 820
Calculation steps:
[( 820 - 998 ) ÷ 998] x 100 = -17.84%
Formula
Percentage change = [(820 - 998) / 998] x 100
Subtract the new number by the original number
820 - 998 = -178
-178 ÷ 998 = -0.17835671342685372
-0.17835671342685372 x 100 = -17.84%