-57.27% is the change from 990 to 423
Calculation steps:
[( 423 - 990 ) ÷ 990] x 100 = -57.27%
Formula
Percentage change = [(423 - 990) / 990] x 100
Subtract the new number by the original number
423 - 990 = -567
-567 ÷ 990 = -0.5727272727272728
-0.5727272727272728 x 100 = -57.27%