-29.66% is the change from 907 to 638
Calculation steps:
[( 638 - 907 ) ÷ 907] x 100 = -29.66%
Formula
Percentage change = [(638 - 907) / 907] x 100
Subtract the new number by the original number
638 - 907 = -269
-269 ÷ 907 = -0.2965821389195149
-0.2965821389195149 x 100 = -29.66%