-68.07% is the change from 971 to 310
Calculation steps:
[( 310 - 971 ) ÷ 971] x 100 = -68.07%
Formula
Percentage change = [(310 - 971) / 971] x 100
Subtract the new number by the original number
310 - 971 = -661
-661 ÷ 971 = -0.6807415036045315
-0.6807415036045315 x 100 = -68.07%