-66.56% is the change from 930 to 311
Calculation steps:
[( 311 - 930 ) ÷ 930] x 100 = -66.56%
Formula
Percentage change = [(311 - 930) / 930] x 100
Subtract the new number by the original number
311 - 930 = -619
-619 ÷ 930 = -0.6655913978494624
-0.6655913978494624 x 100 = -66.56%