-3.41% is the change from 645 to 623
Calculation steps:
[( 623 - 645 ) ÷ 645] x 100 = -3.41%
Formula
Percentage change = [(623 - 645) / 645] x 100
Subtract the new number by the original number
623 - 645 = -22
-22 ÷ 645 = -0.034108527131782945
-0.034108527131782945 x 100 = -3.41%