-37.64% is the change from 999 to 623
Calculation steps:
[( 623 - 999 ) ÷ 999] x 100 = -37.64%
Formula
Percentage change = [(623 - 999) / 999] x 100
Subtract the new number by the original number
623 - 999 = -376
-376 ÷ 999 = -0.3763763763763764
-0.3763763763763764 x 100 = -37.64%