-81.5% is the change from 919 to 170
Calculation steps:
[( 170 - 919 ) ÷ 919] x 100 = -81.5%
Formula
Percentage change = [(170 - 919) / 919] x 100
Subtract the new number by the original number
170 - 919 = -749
-749 ÷ 919 = -0.8150163220892275
-0.8150163220892275 x 100 = -81.5%