-23.09% is the change from 641 to 493
Calculation steps:
[( 493 - 641 ) ÷ 641] x 100 = -23.09%
Formula
Percentage change = [(493 - 641) / 641] x 100
Subtract the new number by the original number
493 - 641 = -148
-148 ÷ 641 = -0.23088923556942278
-0.23088923556942278 x 100 = -23.09%