-81.39% is the change from 919 to 171
Calculation steps:
[( 171 - 919 ) ÷ 919] x 100 = -81.39%
Formula
Percentage change = [(171 - 919) / 919] x 100
Subtract the new number by the original number
171 - 919 = -748
-748 ÷ 919 = -0.8139281828073993
-0.8139281828073993 x 100 = -81.39%