-78.72% is the change from 813 to 173
Calculation steps:
[( 173 - 813 ) ÷ 813] x 100 = -78.72%
Formula
Percentage change = [(173 - 813) / 813] x 100
Subtract the new number by the original number
173 - 813 = -640
-640 ÷ 813 = -0.7872078720787208
-0.7872078720787208 x 100 = -78.72%