-97.17% is the change from 813 to 23
Calculation steps:
[( 23 - 813 ) ÷ 813] x 100 = -97.17%
Formula
Percentage change = [(23 - 813) / 813] x 100
Subtract the new number by the original number
23 - 813 = -790
-790 ÷ 813 = -0.971709717097171
-0.971709717097171 x 100 = -97.17%