-78.8% is the change from 816 to 173
Calculation steps:
[( 173 - 816 ) ÷ 816] x 100 = -78.8%
Formula
Percentage change = [(173 - 816) / 816] x 100
Subtract the new number by the original number
173 - 816 = -643
-643 ÷ 816 = -0.7879901960784313
-0.7879901960784313 x 100 = -78.8%