-15.91% is the change from 817 to 687
Calculation steps:
[( 687 - 817 ) ÷ 817] x 100 = -15.91%
Formula
Percentage change = [(687 - 817) / 817] x 100
Subtract the new number by the original number
687 - 817 = -130
-130 ÷ 817 = -0.1591187270501836
-0.1591187270501836 x 100 = -15.91%