-21.67% is the change from 826 to 647
Calculation steps:
[( 647 - 826 ) ÷ 826] x 100 = -21.67%
Formula
Percentage change = [(647 - 826) / 826] x 100
Subtract the new number by the original number
647 - 826 = -179
-179 ÷ 826 = -0.21670702179176757
-0.21670702179176757 x 100 = -21.67%