-66.3% is the change from 920 to 310
Calculation steps:
[( 310 - 920 ) ÷ 920] x 100 = -66.3%
Formula
Percentage change = [(310 - 920) / 920] x 100
Subtract the new number by the original number
310 - 920 = -610
-610 ÷ 920 = -0.6630434782608695
-0.6630434782608695 x 100 = -66.3%