-39.76% is the change from 664 to 400
Calculation steps:
[( 400 - 664 ) ÷ 664] x 100 = -39.76%
Formula
Percentage change = [(400 - 664) / 664] x 100
Subtract the new number by the original number
400 - 664 = -264
-264 ÷ 664 = -0.39759036144578314
-0.39759036144578314 x 100 = -39.76%