-17.29% is the change from 781 to 646
Calculation steps:
[( 646 - 781 ) ÷ 781] x 100 = -17.29%
Formula
Percentage change = [(646 - 781) / 781] x 100
Subtract the new number by the original number
646 - 781 = -135
-135 ÷ 781 = -0.17285531370038412
-0.17285531370038412 x 100 = -17.29%