-81.86% is the change from 915 to 166
Calculation steps:
[( 166 - 915 ) ÷ 915] x 100 = -81.86%
Formula
Percentage change = [(166 - 915) / 915] x 100
Subtract the new number by the original number
166 - 915 = -749
-749 ÷ 915 = -0.8185792349726776
-0.8185792349726776 x 100 = -81.86%