-21.33% is the change from 844 to 664
Calculation steps:
[( 664 - 844 ) ÷ 844] x 100 = -21.33%
Formula
Percentage change = [(664 - 844) / 844] x 100
Subtract the new number by the original number
664 - 844 = -180
-180 ÷ 844 = -0.2132701421800948
-0.2132701421800948 x 100 = -21.33%