-45.02% is the change from 311 to 171
Calculation steps:
[( 171 - 311 ) ÷ 311] x 100 = -45.02%
Formula
Percentage change = [(171 - 311) / 311] x 100
Subtract the new number by the original number
171 - 311 = -140
-140 ÷ 311 = -0.45016077170418006
-0.45016077170418006 x 100 = -45.02%