-21.3% is the change from 798 to 628
Calculation steps:
[( 628 - 798 ) ÷ 798] x 100 = -21.3%
Formula
Percentage change = [(628 - 798) / 798] x 100
Subtract the new number by the original number
628 - 798 = -170
-170 ÷ 798 = -0.21303258145363407
-0.21303258145363407 x 100 = -21.3%