-81.21% is the change from 910 to 171
Calculation steps:
[( 171 - 910 ) ÷ 910] x 100 = -81.21%
Formula
Percentage change = [(171 - 910) / 910] x 100
Subtract the new number by the original number
171 - 910 = -739
-739 ÷ 910 = -0.8120879120879121
-0.8120879120879121 x 100 = -81.21%