-32.9% is the change from 310 to 208
Calculation steps:
[( 208 - 310 ) ÷ 310] x 100 = -32.9%
Formula
Percentage change = [(208 - 310) / 310] x 100
Subtract the new number by the original number
208 - 310 = -102
-102 ÷ 310 = -0.32903225806451614
-0.32903225806451614 x 100 = -32.9%