-15.06% is the change from 810 to 688
Calculation steps:
[( 688 - 810 ) ÷ 810] x 100 = -15.06%
Formula
Percentage change = [(688 - 810) / 810] x 100
Subtract the new number by the original number
688 - 810 = -122
-122 ÷ 810 = -0.1506172839506173
-0.1506172839506173 x 100 = -15.06%