-97.18% is the change from 815 to 23
Calculation steps:
[( 23 - 815 ) ÷ 815] x 100 = -97.18%
Formula
Percentage change = [(23 - 815) / 815] x 100
Subtract the new number by the original number
23 - 815 = -792
-792 ÷ 815 = -0.9717791411042945
-0.9717791411042945 x 100 = -97.18%