-19.93% is the change from 808 to 647
Calculation steps:
[( 647 - 808 ) ÷ 808] x 100 = -19.93%
Formula
Percentage change = [(647 - 808) / 808] x 100
Subtract the new number by the original number
647 - 808 = -161
-161 ÷ 808 = -0.19925742574257427
-0.19925742574257427 x 100 = -19.93%