-20.6% is the change from 631 to 501
Calculation steps:
[( 501 - 631 ) ÷ 631] x 100 = -20.6%
Formula
Percentage change = [(501 - 631) / 631] x 100
Subtract the new number by the original number
501 - 631 = -130
-130 ÷ 631 = -0.20602218700475436
-0.20602218700475436 x 100 = -20.6%