-66.34% is the change from 921 to 310
Calculation steps:
[( 310 - 921 ) ÷ 921] x 100 = -66.34%
Formula
Percentage change = [(310 - 921) / 921] x 100
Subtract the new number by the original number
310 - 921 = -611
-611 ÷ 921 = -0.6634093376764386
-0.6634093376764386 x 100 = -66.34%