-67.67% is the change from 993 to 321
Calculation steps:
[( 321 - 993 ) ÷ 993] x 100 = -67.67%
Formula
Percentage change = [(321 - 993) / 993] x 100
Subtract the new number by the original number
321 - 993 = -672
-672 ÷ 993 = -0.676737160120846
-0.676737160120846 x 100 = -67.67%