-77.74% is the change from 993 to 221
Calculation steps:
[( 221 - 993 ) ÷ 993] x 100 = -77.74%
Formula
Percentage change = [(221 - 993) / 993] x 100
Subtract the new number by the original number
221 - 993 = -772
-772 ÷ 993 = -0.7774420946626385
-0.7774420946626385 x 100 = -77.74%