-37.84% is the change from 999 to 621
Calculation steps:
[( 621 - 999 ) ÷ 999] x 100 = -37.84%
Formula
Percentage change = [(621 - 999) / 999] x 100
Subtract the new number by the original number
621 - 999 = -378
-378 ÷ 999 = -0.3783783783783784
-0.3783783783783784 x 100 = -37.84%