-91.34% is the change from 935 to 81
Calculation steps:
[( 81 - 935 ) ÷ 935] x 100 = -91.34%
Formula
Percentage change = [(81 - 935) / 935] x 100
Subtract the new number by the original number
81 - 935 = -854
-854 ÷ 935 = -0.9133689839572192
-0.9133689839572192 x 100 = -91.34%