-0.63% is the change from 317 to 315
Calculation steps:
[( 315 - 317 ) ÷ 317] x 100 = -0.63%
Formula
Percentage change = [(315 - 317) / 317] x 100
Subtract the new number by the original number
315 - 317 = -2
-2 ÷ 317 = -0.006309148264984227
-0.006309148264984227 x 100 = -0.63%