-88.08% is the change from 646 to 77
Calculation steps:
[( 77 - 646 ) ÷ 646] x 100 = -88.08%
Formula
Percentage change = [(77 - 646) / 646] x 100
Subtract the new number by the original number
77 - 646 = -569
-569 ÷ 646 = -0.8808049535603715
-0.8808049535603715 x 100 = -88.08%