-37.7% is the change from 1000 to 623
Calculation steps:
[( 623 - 1000 ) ÷ 1000] x 100 = -37.7%
Formula
Percentage change = [(623 - 1000) / 1000] x 100
Subtract the new number by the original number
623 - 1000 = -377
-377 ÷ 1000 = -0.377
-0.377 x 100 = -37.7%