-81.08% is the change from 909 to 172
Calculation steps:
[( 172 - 909 ) ÷ 909] x 100 = -81.08%
Formula
Percentage change = [(172 - 909) / 909] x 100
Subtract the new number by the original number
172 - 909 = -737
-737 ÷ 909 = -0.8107810781078107
-0.8107810781078107 x 100 = -81.08%