-30.74% is the change from 309 to 214
Calculation steps:
[( 214 - 309 ) ÷ 309] x 100 = -30.74%
Formula
Percentage change = [(214 - 309) / 309] x 100
Subtract the new number by the original number
214 - 309 = -95
-95 ÷ 309 = -0.3074433656957929
-0.3074433656957929 x 100 = -30.74%