-20.56% is the change from 817 to 649
Calculation steps:
[( 649 - 817 ) ÷ 817] x 100 = -20.56%
Formula
Percentage change = [(649 - 817) / 817] x 100
Subtract the new number by the original number
649 - 817 = -168
-168 ÷ 817 = -0.20563035495716034
-0.20563035495716034 x 100 = -20.56%