-17% is the change from 988 to 820
Calculation steps:
[( 820 - 988 ) ÷ 988] x 100 = -17%
Formula
Percentage change = [(820 - 988) / 988] x 100
Subtract the new number by the original number
820 - 988 = -168
-168 ÷ 988 = -0.1700404858299595
-0.1700404858299595 x 100 = -17%