-15.78% is the change from 767 to 646
Calculation steps:
[( 646 - 767 ) ÷ 767] x 100 = -15.78%
Formula
Percentage change = [(646 - 767) / 767] x 100
Subtract the new number by the original number
646 - 767 = -121
-121 ÷ 767 = -0.1577574967405476
-0.1577574967405476 x 100 = -15.78%