-78.64% is the change from 810 to 173
Calculation steps:
[( 173 - 810 ) ÷ 810] x 100 = -78.64%
Formula
Percentage change = [(173 - 810) / 810] x 100
Subtract the new number by the original number
173 - 810 = -637
-637 ÷ 810 = -0.7864197530864198
-0.7864197530864198 x 100 = -78.64%