-40.63% is the change from 667 to 396
Calculation steps:
[( 396 - 667 ) ÷ 667] x 100 = -40.63%
Formula
Percentage change = [(396 - 667) / 667] x 100
Subtract the new number by the original number
396 - 667 = -271
-271 ÷ 667 = -0.4062968515742129
-0.4062968515742129 x 100 = -40.63%