-67.77% is the change from 993 to 320
Calculation steps:
[( 320 - 993 ) ÷ 993] x 100 = -67.77%
Formula
Percentage change = [(320 - 993) / 993] x 100
Subtract the new number by the original number
320 - 993 = -673
-673 ÷ 993 = -0.6777442094662638
-0.6777442094662638 x 100 = -67.77%