-21.86% is the change from 636 to 497
Calculation steps:
[( 497 - 636 ) ÷ 636] x 100 = -21.86%
Formula
Percentage change = [(497 - 636) / 636] x 100
Subtract the new number by the original number
497 - 636 = -139
-139 ÷ 636 = -0.21855345911949686
-0.21855345911949686 x 100 = -21.86%