-87.52% is the change from 817 to 102
Calculation steps:
[( 102 - 817 ) ÷ 817] x 100 = -87.52%
Formula
Percentage change = [(102 - 817) / 817] x 100
Subtract the new number by the original number
102 - 817 = -715
-715 ÷ 817 = -0.8751529987760098
-0.8751529987760098 x 100 = -87.52%