-31.66% is the change from 638 to 436
Calculation steps:
[( 436 - 638 ) ÷ 638] x 100 = -31.66%
Formula
Percentage change = [(436 - 638) / 638] x 100
Subtract the new number by the original number
436 - 638 = -202
-202 ÷ 638 = -0.3166144200626959
-0.3166144200626959 x 100 = -31.66%