-91.02% is the change from 902 to 81
Calculation steps:
[( 81 - 902 ) ÷ 902] x 100 = -91.02%
Formula
Percentage change = [(81 - 902) / 902] x 100
Subtract the new number by the original number
81 - 902 = -821
-821 ÷ 902 = -0.9101995565410199
-0.9101995565410199 x 100 = -91.02%