-20.42% is the change from 808 to 643
Calculation steps:
[( 643 - 808 ) ÷ 808] x 100 = -20.42%
Formula
Percentage change = [(643 - 808) / 808] x 100
Subtract the new number by the original number
643 - 808 = -165
-165 ÷ 808 = -0.2042079207920792
-0.2042079207920792 x 100 = -20.42%