-67.9% is the change from 997 to 320
Calculation steps:
[( 320 - 997 ) ÷ 997] x 100 = -67.9%
Formula
Percentage change = [(320 - 997) / 997] x 100
Subtract the new number by the original number
320 - 997 = -677
-677 ÷ 997 = -0.679037111334002
-0.679037111334002 x 100 = -67.9%