-63.08% is the change from 921 to 340
Calculation steps:
[( 340 - 921 ) ÷ 921] x 100 = -63.08%
Formula
Percentage change = [(340 - 921) / 921] x 100
Subtract the new number by the original number
340 - 921 = -581
-581 ÷ 921 = -0.6308360477741585
-0.6308360477741585 x 100 = -63.08%