-36.9% is the change from 645 to 407
Calculation steps:
[( 407 - 645 ) ÷ 645] x 100 = -36.9%
Formula
Percentage change = [(407 - 645) / 645] x 100
Subtract the new number by the original number
407 - 645 = -238
-238 ÷ 645 = -0.3689922480620155
-0.3689922480620155 x 100 = -36.9%