-21.32% is the change from 849 to 668
Calculation steps:
[( 668 - 849 ) ÷ 849] x 100 = -21.32%
Formula
Percentage change = [(668 - 849) / 849] x 100
Subtract the new number by the original number
668 - 849 = -181
-181 ÷ 849 = -0.21319199057714958
-0.21319199057714958 x 100 = -21.32%