-20.99% is the change from 805 to 636
Calculation steps:
[( 636 - 805 ) ÷ 805] x 100 = -20.99%
Formula
Percentage change = [(636 - 805) / 805] x 100
Subtract the new number by the original number
636 - 805 = -169
-169 ÷ 805 = -0.20993788819875778
-0.20993788819875778 x 100 = -20.99%