-17.47% is the change from 807 to 666
Calculation steps:
[( 666 - 807 ) ÷ 807] x 100 = -17.47%
Formula
Percentage change = [(666 - 807) / 807] x 100
Subtract the new number by the original number
666 - 807 = -141
-141 ÷ 807 = -0.17472118959107807
-0.17472118959107807 x 100 = -17.47%