-21.51% is the change from 809 to 635
Calculation steps:
[( 635 - 809 ) ÷ 809] x 100 = -21.51%
Formula
Percentage change = [(635 - 809) / 809] x 100
Subtract the new number by the original number
635 - 809 = -174
-174 ÷ 809 = -0.21508034610630408
-0.21508034610630408 x 100 = -21.51%