-34.19% is the change from 310 to 204
Calculation steps:
[( 204 - 310 ) ÷ 310] x 100 = -34.19%
Formula
Percentage change = [(204 - 310) / 310] x 100
Subtract the new number by the original number
204 - 310 = -106
-106 ÷ 310 = -0.3419354838709677
-0.3419354838709677 x 100 = -34.19%