-78.74% is the change from 809 to 172
Calculation steps:
[( 172 - 809 ) ÷ 809] x 100 = -78.74%
Formula
Percentage change = [(172 - 809) / 809] x 100
Subtract the new number by the original number
172 - 809 = -637
-637 ÷ 809 = -0.7873918417799752
-0.7873918417799752 x 100 = -78.74%