-18.71% is the change from 834 to 678
Calculation steps:
[( 678 - 834 ) ÷ 834] x 100 = -18.71%
Formula
Percentage change = [(678 - 834) / 834] x 100
Subtract the new number by the original number
678 - 834 = -156
-156 ÷ 834 = -0.18705035971223022
-0.18705035971223022 x 100 = -18.71%