-30.29% is the change from 307 to 214
Calculation steps:
[( 214 - 307 ) ÷ 307] x 100 = -30.29%
Formula
Percentage change = [(214 - 307) / 307] x 100
Subtract the new number by the original number
214 - 307 = -93
-93 ÷ 307 = -0.30293159609120524
-0.30293159609120524 x 100 = -30.29%