-17.51% is the change from 834 to 688
Calculation steps:
[( 688 - 834 ) ÷ 834] x 100 = -17.51%
Formula
Percentage change = [(688 - 834) / 834] x 100
Subtract the new number by the original number
688 - 834 = -146
-146 ÷ 834 = -0.1750599520383693
-0.1750599520383693 x 100 = -17.51%