-21.79% is the change from 849 to 664
Calculation steps:
[( 664 - 849 ) ÷ 849] x 100 = -21.79%
Formula
Percentage change = [(664 - 849) / 849] x 100
Subtract the new number by the original number
664 - 849 = -185
-185 ÷ 849 = -0.21790341578327443
-0.21790341578327443 x 100 = -21.79%