-61.93% is the change from 817 to 311
Calculation steps:
[( 311 - 817 ) ÷ 817] x 100 = -61.93%
Formula
Percentage change = [(311 - 817) / 817] x 100
Subtract the new number by the original number
311 - 817 = -506
-506 ÷ 817 = -0.6193390452876377
-0.6193390452876377 x 100 = -61.93%