-20.12% is the change from 805 to 643
Calculation steps:
[( 643 - 805 ) ÷ 805] x 100 = -20.12%
Formula
Percentage change = [(643 - 805) / 805] x 100
Subtract the new number by the original number
643 - 805 = -162
-162 ÷ 805 = -0.20124223602484473
-0.20124223602484473 x 100 = -20.12%