-32.86% is the change from 639 to 429
Calculation steps:
[( 429 - 639 ) ÷ 639] x 100 = -32.86%
Formula
Percentage change = [(429 - 639) / 639] x 100
Subtract the new number by the original number
429 - 639 = -210
-210 ÷ 639 = -0.3286384976525822
-0.3286384976525822 x 100 = -32.86%