-91.18% is the change from 918 to 81
Calculation steps:
[( 81 - 918 ) ÷ 918] x 100 = -91.18%
Formula
Percentage change = [(81 - 918) / 918] x 100
Subtract the new number by the original number
81 - 918 = -837
-837 ÷ 918 = -0.9117647058823529
-0.9117647058823529 x 100 = -91.18%