-3.15% is the change from 317 to 307
Calculation steps:
[( 307 - 317 ) ÷ 317] x 100 = -3.15%
Formula
Percentage change = [(307 - 317) / 317] x 100
Subtract the new number by the original number
307 - 317 = -10
-10 ÷ 317 = -0.031545741324921134
-0.031545741324921134 x 100 = -3.15%