-3.23% is the change from 866 to 838
Calculation steps:
[( 838 - 866 ) ÷ 866] x 100 = -3.23%
Formula
Percentage change = [(838 - 866) / 866] x 100
Subtract the new number by the original number
838 - 866 = -28
-28 ÷ 866 = -0.03233256351039261
-0.03233256351039261 x 100 = -3.23%