-61.44% is the change from 817 to 315
Calculation steps:
[( 315 - 817 ) ÷ 817] x 100 = -61.44%
Formula
Percentage change = [(315 - 817) / 817] x 100
Subtract the new number by the original number
315 - 817 = -502
-502 ÷ 817 = -0.6144430844553244
-0.6144430844553244 x 100 = -61.44%