-78.84% is the change from 813 to 172
Calculation steps:
[( 172 - 813 ) ÷ 813] x 100 = -78.84%
Formula
Percentage change = [(172 - 813) / 813] x 100
Subtract the new number by the original number
172 - 813 = -641
-641 ÷ 813 = -0.7884378843788438
-0.7884378843788438 x 100 = -78.84%