-2.68% is the change from 857 to 834
Calculation steps:
[( 834 - 857 ) ÷ 857] x 100 = -2.68%
Formula
Percentage change = [(834 - 857) / 857] x 100
Subtract the new number by the original number
834 - 857 = -23
-23 ÷ 857 = -0.026837806301050177
-0.026837806301050177 x 100 = -2.68%