-37.78% is the change from 998 to 621
Calculation steps:
[( 621 - 998 ) ÷ 998] x 100 = -37.78%
Formula
Percentage change = [(621 - 998) / 998] x 100
Subtract the new number by the original number
621 - 998 = -377
-377 ÷ 998 = -0.3777555110220441
-0.3777555110220441 x 100 = -37.78%