-21.07% is the change from 394 to 311
Calculation steps:
[( 311 - 394 ) ÷ 394] x 100 = -21.07%
Formula
Percentage change = [(311 - 394) / 394] x 100
Subtract the new number by the original number
311 - 394 = -83
-83 ÷ 394 = -0.21065989847715735
-0.21065989847715735 x 100 = -21.07%